Amendments are debatable if what is being amended is debatable. Postpone Indefinitely A motion to postpone indefinitely, with the approval of a majority of the Senate, effectively kills an item of business. The intended purpose of this motion is to vote down a bill, without having to vote against the merits of the bill. This motion is debatable. Main Motion A main motion is a vehicle to bring a new topic to the floor for consideration.
All legislation is a form of a main motion.
Other main motions would include motions to discharge from committee, take from the table, and to approve the minutes. Main motions are always debatable. If you are considering a suspension of the rules, it is highly recommended that you consult the parliamentarian. In most cases, it is preferable to avoid a suspension of the rules. A senator may raise a point of order, without a second, that one or more of the rules of the Senate are being violated.