Brown’s first meeting on Capitol Hill Thursday will be in the 10 a.m. ET hour with Sen. John McCain of Arizona. McCain, the 2008 GOP presidential nominee, endorsed Brown’s bid to fill the last three years of the term of the late Sen. Ted Kennedy. In the January 3 endorsement, McCain said of Brown that “as an officer on the Army National Guard, he understands the importance of a strong military and the necessity of protecting our interests around the world.”

McCain is a retired naval aviator who was shot down and served as a prisoner of war during the Vietnam War.

McCain, through his Country First political action committee, is calling on Democrats to seat Brown immediately.