According to The Hill, staffers for the Arizona senators were interviewed about a land deal, which figures prominently in the case against Rep. Renzi.   Expect a "speech and debate clause" defense from Renzi at some point soon:

Federal agents interviewed staffers for likely Republican presidential nominee Sen. John McCain (Ariz.) as part of their corruption case against Rep. Rick Renzi (R-Ariz.).

U.S. Attorney for the District of Arizona Diane J. Humetewa and fellow prosecutors disclosed the interviews with aides for McCain and fellow Arizona Republican Sen. Jon Kyl in a written response to Renzi’s attorneys, who asked for the contents of the interview to help prepare for Renzi’s upcoming trial, which is scheduled for October.

The aides were interviewed about land exchanges, according to an April letter from Humetewa filed with the U.S. District Court of Arizona late last week. The letter did not indicate when the interviews occurred.

A federal land swap critical to developing a $3 billion copper mine southeast of Phoenix is at the heart of the case against Renzi, who is facing 35 public corruption charges, including conspiracy, money-laundering, extortion and insurance fraud. Renzi is retiring at the end of this session.