The two senators worked together in 2002 to pass the McCain-Feingold campaign finance reform bill – a move for which conservatives have since needled McCain. “We are of different parties, and our political views are often opposed,” McCain said. “But where we agreed – on wasteful spending, ethics reform, campaign finance reform and other issues – it was a privilege to fight alongside and not against Russ Feingold.”

McCain said he will miss Feingold not just as a colleague but as a friend. “I have treasured that friendship all the years we have served together, and while friendship does not end with a Senate career, I will sorely miss his presence here,” he said.