(CNN) – The Senate will move forward in confirming President Barack Obama’s nominee to become defense secretary this week, a leading Republican who opposes Chuck Hagel’s elevation to the role said Sunday.

“I don’t believe Chuck Hagel, who is a friend of mine, is qualified to be secretary of defense. But I do believe that elections have consequences, unfortunately, and the president of the United States was re-elected,” Sen. John McCain said on “State of the Union.”

The Senate will vote again Tuesday on whether to end a Republican filibuster of Hagel’s nomination. Two weeks ago, a similar attempt fell short of the 60 votes needed to end the debate. Many GOP lawmakers and aides expect Hagel to be confirmed, although with just a handful of GOP votes.