except Treason, Felony and Breach of the Peace, be privileged from Arrest during their Attendance at the Session of their respective Houses, and in going to and returning from the same; and for any Speech or Debate in either House, they shall not be questioned in any other Place."
At best, he can't be arrested for failure to honor certain subpoenas
when he is attending a Senate session, or traveling to or from a session and cannot be compelled to testify in Court
about remarks on the floor of the SenateThe shows that the Senate has only been holding sessions on Mondays and Thursdays since mid-October; see:
Days in Session Calendar
http://thomas.loc.gov/home/ds/s1102.htmlThe subpoena was reported towards the end of October; see:
Chambliss subpoenaed in Imperial Sugar case
Larry Peterson | Thursday, October 23, 2008 at 11:25 pm
... Graham said at a July Senate hearing that the company stymied his efforts to make the plants safer. At the hearing, Chambliss, who in 2007 received $1,000 from Imperial's political committee, badgered Graham and questioned the Imperial executive's sincerity. The subpoena orders Chambliss to testify under oath Thursday at Tate's office. It also tells him to produce papers and e-mails provided to him by Imperial, related companies and Imperial's law firm. Tate says Imperial might have prompted Chambliss to confront Graham at the hearing, which focused on the Feb. 7 inferno ...
http://savannahnow.com/node/601042