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From the DOJ's Criminal Resource Manual:

The Speech and Debate Clause
The Federal offenses of bribery and gratuities apply to payments made in consideration for, or to thank or curry favor with, Members of Congress and their legislative staffs. However, where an official of the Legislative Branch is the intended recipient, the task of proving the "official act" element can present prosecutors with unique challenges rooted in the Speech and Debate Clause of the U.S. Constitution. U.S. Constit. Art I, sec 6, cl 1.
The Speech and Debate Clause provides the "legislative acts" of a Senator or a Representative "shall not be questioned in any place." It applies in criminal as well as civil litigation involving the Senator or Representative, and provides absolute immunity to United States Senators and Representatives while they are engaged in legislative acts. United States v. Brewster, 408 U.S. 501 (1972); United States v. Helstoski, 442 U.S. 477 (1976). Its purpose is to assure the Congress a wide and unfettered latitude of freedom of speech in the deliberative process surrounding enacting legislation, and to shield that process from potential intimidation from the Executive and Judicial Branches. Gravel v. United States, 408 U.S. 606 (1972); Powell v. McCormick, 395 U.S. 486 (1969).
While the Speech and Debate Clause has been expressly held not to shield Senators or Representatives against bribery charges, United States v. Johnson, 383 U.S. 169 (1966), it does impose significant limits on the type of evidence that can be used to prove such an offense. The Clause broadly protects members of Congress "against inquiry into acts that occur in the regular course of the legislative process and into the motivation for those acts," United States v. Brewster, 408 U.S. 501, 525 (1972), and "precludes any showing of how [a member of Congress], acted, voted, or decided." Id. at 527. The Supreme Court has declared that "past legislative acts of a Member cannot be admitted without undermining the values protected by the Clause," including speeches in committee as well as those on the Floor of the Chamber, the Senator or Representative's votes, and his or her explanations for them. A somewhat wider latitude has been allowed insofar as the admissibility of activities that occurred prior to a legislative act. United States v. Helstoski, 442 U.S. 477, 489 (1979). However, the parameters of what constitutes a "legislative act" are quite broad, and can severely impair the ability of prosecutors to prove bribery and gratuity cases where the recipient is an elected Member of the Legislative Branch.
When evidence embraced by this privilege is introduced--either in trial or in grand jury proceedings--the effect can be as troubling to the prosecution as introducing the fruits of an illegal search. See United States v. Durenburger, 1993 WL 738477 (D.Minn 1993); Helstoski, supra; compare Johnson.
In addition, both the House and the Senate consider that the Speech and Debate Clause gives them an institutional right to refuse requests for information that originate in the Executive or the Judicial Branches that concern the legislative process. Thus, most requests for information and testimony dealing with the legislative process must be presented to the Chamber affected, and that Chamber permitted to vote on whether or not to produce the information sought. This applies to grand jury subpoenas, and to requests that seek testimony as well as documents. The customary practice when seeking information from the Legislative Branch which is not voluntarily forthcoming from a Senator or Member is to route the request through the Clerk of the House or the Secretary of the Senate. This process can be time-consuming. However, bona fide requests for information bearing on ongoing criminal inquiries have been rarely refused.
The Public Integrity Section of Criminal Division has significant expertise in addressing and overcoming Speech and Debate issues. Prosecutors are encouraged to contact Public Integrity when the official acts of an elected Member of the Legislative Branch become the focus of a criminal inquiry.