Paragraph 5(a) of Senate Rule XXVI, sometimes referred to as the "two-hour rule," restricts the times that most Senate committees and subcommittees can meet when the full Senate is in session. The rule, which has evolved over the years, is intended to help balance the Senate's committee and floor work and to minimize the logistical conflicts that Senators face between participating in committee hearings and markups and attending to their duties on the chamber floor. The two-hour rule applies to all committee meetings, including hearings and markups. Pursuant to paragraph 5(a) of Senate Rule XXVI, no Senate committee or subcommittee (except for the Appropriations and Budget Committees and their subcommittees) can meet after the Senate has been in session for two hours or past 2:00 p.m. unless both the majority and minority leaders (or their designees) agree to permit the meeting and their agreement has been announced on the floor. The Senate can also, by unanimous consent, grant permission for committees to meet, and until recently the practice was for a Senator to ask unanimous consent that committees be authorized to meet, rather than for the leaders to announce their agreement that meetings be permitted. A third but arguably impractical option is for the Senate to adopt a privileged motion to allow the meeting. Most of the time, the restrictions of the two-hour rule are not invoked. It is a routine, often daily, occurrence for committees to be given permission to meet during periods proscribed by the rule after agreements are announced on the Senate floor that grant them the authority to do so. Committee staff, when preparing for a hearing or a markup, routinely notify floor staff of the time and date of the meeting to ensure it is included in any unanimous consent agreement or joint leadership announcement. Sometimes, however, the two-hour rule's restrictions on committee meeting are insisted upon, most commonly as a form of protest or to delay a committee's action on a specific measure or matter. To invoke the rule does not necessarily require any formal parliamentary action. Senators can object if a unanimous consent agreement for committees to meet is propounded on the floor. In practice, however, informal communication with leadership is likely required to invoke the rule. This is true not only because the leaders alone could grant permission for committees to meet but also because, from a practical perspective, it would be difficult for Senators to predict when any unanimous consent agreement might be propounded so that they could arrange to be present to object. It was the long-standing practice of the Senate that, after receiving the requests from committees and clearing them with the minority leader, the majority leader (or a designee) would state on the floor I have [number] unanimous consent requests for committees to meet during today's session of the Senate. They have the approval of the majority and minority leaders. I ask consent that these requests be agreed to and these requests be printed in the R ecord . If no Senator objected, the Congressional Record would print, as if they were spoken on the floor, a series of unanimous consent requests for each committee to meet at stated times, each request being ordered "without objection." Perhaps partly due to this practice, it was widely understood in the Senate that unanimous consent was necessary to permit committees to meet after the Senate was in session for two hours or past 2:00 p.m. If leaders usually honored any request to prevent committees from meeting, then that practice would also leave the impression that unanimous consent was required. Currently, permission for Senate committees to sit during times prohibited by the two-hour rule is being granted almost exclusively by joint leadership agreement instead of by unanimous consent, a change from prior practice. A Senator on the floor now typically states I have [number] requests for committees to meet during today's session of the Senate. They have the approval of the majority and minority leaders. The presiding officer responds, "duly noted" to the Senator; no opportunity is afforded for a Senator to object, because unanimous consent is not requested. The list of committees authorized to meet is then printed in the Congressional Record following the statement made on the floor . Joint leadership permission has been used over 130 times since November 30, 2016, to authorize one or more Senate committees to meet during restricted hours and now appears to be the preferred way to provide a waiver of the rule. The change in practice might be in response to an apparent increase in invoking the rule, discussed in the final section of this report. The consequences for a Senate committee of violating the two-hour rule are potentially significant. Any action taken by a committee during a meeting prohibited by the rule is "null, void, and of no effect." For example, a nomination reported by a committee when it did not have authority to meet "is not properly before the Senate and, on a point of order, will be returned to committee." If a Senate committee was meeting without permission, it would immediately have to adjourn when the restricted hour arrived in order to comply with the rule. In response to the two-hour rule being invoked, a Senate committee could cancel its meeting or reschedule it to periods not covered by the rule—for example, meeting early in the morning before the Senate has convened or after it has adjourned. The Senate could also recess or adjourn in order for a committee to sit during the hours restricted by the two-hour rule, and in some cases it has done so in order for a committee to hear testimony or act on an important measure or matter. There are examples of Senate committees adjourning an official hearing pursuant to the two-hour rule and continuing to interact with witnesses in a non-formal setting, characterized as a "briefing" or "listening session." Such gatherings are not official, however, and do not enjoy the same powers and protections of actual Senate hearings. For example, witnesses could not testify under oath at such a meeting, and no official transcript of the interactions would be kept. Senate rules restricting committee meeting times have existed for over 70 years and have evolved over time. A rule limiting committees from sitting while the Senate is in session was first enacted in Section 134(c) of P.L. 79-753, the Legislative Reorganization Act (LRA) of 1946, which stated No standing committee of the Senate or the House, except the Committee on Rules of the House, shall sit without special leave, while the Senate or the House, as the case may be, is in session. The stated intent of the1946 rule was to reduce scheduling conflicts between committee and floor work. The Senate committee report accompanying the 1946 act predicted that the new rule would "make for closer concentration on committee work, on the one hand, and for fuller attendance on the floor, on the other." Under the 1946 form of the rule, all Senate committees had to cease sitting when the Senate went into session unless the unanimous consent of the Senate to meet was obtained. The provisions of the 1946 LRA were superseded on January 30, 1964, by Senate adoption of S.Res. 111, which placed an amended restriction on committee meetings in (then) paragraph 5 of Rule XXV of the standing rules of the Senate. As adopted, S.Res.111 stated Sec.1 No standing committee shall sit without special leave while the Senate is in session after (1) the conclusion of the morning hour, or (2) the Senate has proceeded to the consideration of unfinished business, pending business, or any other business except private bills and the routine morning business, whichever is earlier. Sec.2 Section 134(c) of the Legislative Reorganization Act of 1946 shall not be applicable to the standing committees of the Senate. The 1964 amendment to the standing rules was intended to provide additional periods for Senate committees to meet. Legislative history documents accompanying S.Res.111 make clear that many Senators felt the 1946 LRA rule had been too restrictive and had impeded the ability of committees to conduct their work. As two Senators noted in individual views in the committee report accompanying S.Res.111 Every Senator has had the experience of having consideration of a measure in which he is vitally interested repeatedly put off because of the inability of standing committees to meet ... while the Senate is in session. The problem has now assumed a chronic and persistent character. Objections against committees sitting are lodged as a matter of course, and often it is only in the exceptional case that a committee is able to secure unanimous consent to sit.... As the sessions of the Congress drag on through the year, the problem of finding time for committee work grows progressively worse. Daily sessions of the Senate begin earlier and end later, occupying an increasingly greater share of the working hours of the day. And, as if matters were not bad enough, as the time available for committee work decreases, the need for time to clear committee dockets before the end of the session grows more urgent. Whereas, under the 1946 LRA provision, no Senate committee could meet at any time that the Senate was in session, the 1964 amendment effected by S.Res. 111 permitted committees to sit during the first two hours of Senate session on a new legislative day (a period known as the "Morning Hour") and immediately thereafter if the Senate was engaged in routine "housekeeping" business or the processing of private bills. Subsequently, Section 117(a) of P.L. 91-510, the Legislative Reorganization Act of 1970, enacted on October 26, 1970, established a provision in law that supplemented the 1964 version of the rule contained in paragraph 5 of Senate Rule XXV. That statutory provision stated Except as otherwise provided in this subsection, no standing committee of the Senate shall sit, without special leave, while the Senate is in session. The prohibition contained in the preceding sentence shall not apply to the Committee on Appropriations of the Senate. Any other standing committee of the Senate may sit for any purpose while the Senate is in session if consent therefor has been obtained from the majority leader and the minority leader of the Senate.