According to the House/Senate Armed Service Committee sites, GEN Petraeus is in the Senate on 4/8 (0930, rm. SD-106) and in the House on 4/9 (0900, rm. 2118 in Rayburn).
RATS
Carl Levin (Michigan)
Chairman
Edward M. Kennedy (Massachusetts)
Robert C. Byrd (West Virginia)
Joseph I. Lieberman (Connecticut)
Jack Reed (Rhode Island)
Daniel K. Akaka (Hawaii)
Bill Nelson (Florida)
E. Benjamin Nelson (Nebraska)
Evan Bayh (Indiana)
Hillary Rodham Clinton (New York)
Mark L. Pryor (Arkansas)
Jim Webb (Virginia)
Claire McCaskill (Missouri)
REPUBLICANS
John McCain (Arizona)
Ranking Member
John W. Warner (Virginia)
James M. Inhofe (Oklahoma)
Jeff Sessions (Alabama)
Susan M. Collins (Maine)
Saxby Chambliss (Georgia)
Lindsey O. Graham (South Carolina)
Elizabeth Dole (North Carolina)
John Cornyn (Texas)
John Thune (South Dakota)
Mel Martinez (Florida)
Roger F. Wicker (Mississippi)