as explained by University of Virgina law professor Robert Turner here.

But as the Supreme Court observed in the 1972 case of U.S. v. Brewster, the clause was never intended to immunize corrupt legislators who violate felony bribery statutes--laws that have expressly applied to members of Congress for more than 150 years. In Brewster, the court noted the clause was not written "to make Members of Congress super-citizens, immune from criminal responsibility," adding: "Taking a bribe is, obviously, no part of the legislative process or function; it is not a legislative act. It is not, by any conceivable interpretation, an act performed as a part of or even incidental to the role of a legislator."

Such behavior is therefore not protected by the Constitution. The purpose of the Speech or Debate Clause was to protect the integrity of the legislative process, and the court noted that bribery, "perhaps even more than Executive power," would "gravely undermine legislative integrity and defeat the right of the public to honest representation."

You might want to look at the 1972 Supreme Court decision, U.S. v. Brewster before attempting to cite the Constitution and ending up looking very, very foolish.