Whose power in the Senate is equal to the power of the Speaker of the House? president pro tempore president of the Senate majority leader majority whip

Majority leader.

Explanation:

The Majority leader is the head of the Senate. He is designated by a vote of the party senators who are in majority in the Senate. He opens and ends sessions, he controls the parliamentary agenda. Nevertheless, the function of president of the Senate belongs to the vice president, he may join the sessions and vote. The majority whip is the second-in-command, so to speak, of the majority party in the Senate, the immediate leader of all his or her fellow party senators.