Title: 117th United States Congress
Content: President of the Senate: Kamala Harris (D), since January 20, 2021 ; Mike Pence (R), until January 20, 2021 ; President pro tempore: Patrick Leahy (D), since January 20, 2021 ; President pro tempore emeritus: Chuck Grassley (R), since January 20, 2021 
Title: Party leaders of the United States Senate
Content:  The Senate is currently composed of 50 Republicans, 48 Democrats, and 2 independents, both of whom caucus with the Democrats. The current leaders are Senators Chuck Schumer (D) of New York and Mitch McConnell (R) of Kentucky. The current assistant leaders, or whips, are Senators Dick Durbin (D) of Illinois and John Thune (R) of South Dakota.
Title: Dean of the United States Senate
Content:  The Dean of the United States Senate is an informal term for the senator with the longest continuous service, regardless of party affiliation. This is not an official position within the Senate, although customarily (since 1945) the longest-serving member of the majority party serves as president pro tempore. The current Dean is Democratic Senator Patrick Leahy of Vermont. He has been in the Senate since 1975 and became Dean in 2012 with the death in office of Daniel Inouye. After Patrick Leahy resigns, retires, or dies, the next Dean of the United States Senate may be Senator Chuck Grassley of Iowa, Senator Mitch McConnell of Kentucky, Senator Richard Shelby of Alabama, Senator Dianne Feinstein of California or Senator Patty Murray of Washington.
Title: President pro tempore of the Senate of the Philippines
Content:  The President pro tempore of the Senate of the Philippines is the second highest-ranking official of the Senate of the Philippines. During the absence of the Senate President, the Senate President pro tempore presides over the Senate. In the current 17th Congress, two senators became Senate President pro tempore and they are Franklin Drilon and Ralph Recto who is the incumbent.
Title: President pro tempore of the United States Senate
Content:  continuously until the election of another. This tradition has been observed without interruption since 1949. Since the enactment of the current Presidential Succession Act in 1947, the president pro tempore is third in the line of succession to the presidency, after the vice president and the speaker of the House of Representatives and ahead of the secretary of state. The current president pro tempore of the Senate is Patrick Leahy of Vermont. He was sworn in on January 20, 2021, during the 117th Congress, when the Democratic Party gained control of the Senate. He previously held the position from 2012 to 2015.
Title: President of the Senate of the Philippines
Content:  As of June 2022, there are four living former Senate presidents.
Title: President of the Senate of the Philippines
Content:  The president of the Senate of the Philippines ( or ) more popularly known as the Senate president, is the presiding officer and the highest-ranking official of the Senate of the Philippines, and third highest and most powerful official in the Government of the Philippines. They are elected by the entire body to be their leader. The Senate president is second in line in succession for the presidency, behind the vice president of the Philippines and in front of the speaker of the House of Representatives of the Philippines. The current Senate president of the 18th Congress of the Philippines is Tito Sotto, who was elected on July 22, 2019.
Title: Current party leaders of the United States Senate
Content:  The party leadership of the United States Senate refers to the officials elected by the Senate Democratic Caucus and the Senate Republican Conference to manage the affairs of each party in the Senate. Each party is led by a floor leader who directs the legislative agenda of their caucus in the Senate, and who is augmented by an Assistant Leader or Whip, and several other officials who work together to manage the floor schedule of legislation, enforce party discipline, and oversee efforts to maintain and grow the party's seats in the Senate. The titular, non-partisan leaders of the Senate itself are the Vice President of the United States, who serves as President of the Senate, and the President pro tempore, the seniormost member of the majority, who theoretically presides in the absence of the Vice President. Unlike committee chairmanships, leadership positions are not traditionally conferred on the basis of seniority, but are elected in closed-door caucuses.
Title: President of the Massachusetts Senate
Content:  The president of the Massachusetts Senate is the presiding officer. Unlike the United States Congress, in which the vice president of the United States is the ex officio president of the United States Senate, in Massachusetts, the president of the Senate is elected from and by the senators. The president, therefore, typically comes from the majority party, and the president is then the de facto leader of that party. The current president of the Massachusetts Senate, since July 26, 2018, is Karen Spilka, a Democrat from Ashland. Democrats have had a majority in the Senate since 1959. Notable former presidents of the Massachusetts Senate include U.S. president Calvin Coolidge.
Title: 15th Congress of the Philippines
Content: President of the Senate ; Juan Ponce Enrile (PMP), elected July 26, 2010, resigned June 5, 2013 ; Jinggoy Estrada (PMP), assumed position June 5, 2013 as Acting President of the Senate ; Senate President Pro-Tempore ; Jinggoy Estrada (PMP), elected July 26, 2010 ; Majority Floor Leader ; Tito Sotto (NPC), ; Minority Floor Leader ; Alan Peter Cayetano (Nacionalista), 

Question: who is currently serving as president of the senate?
Answer: Orrin Hatch.
Patrick Leahy.