Sen. John McCain (R-Ariz.), who has urged his fellow Republicans not to filibuster the nomination of former Nebraska senator Chuck Hagel for defense secretary, now tells Foreign Policy magazine that he might oppose a vote to end debate on President Obama's choice to replace Leon Panetta.

Several Republicans told the magazine that the threshold for Hagel's confirmation would be 60 votes. But they said they were not filibustering the nomination, just placing holds on it. Hagel almost certainly has enough votes to overcome a filibuster; White House spokesman Jay Carney said again Wednesday that the administration expects the nominee to be confirmed.