The current secretary, Leon Panetta, has said the defense “sequester” cuts that Congress mandated to take effect Jan. 1 would have dire consequences for U.S. security. Mr. Hagel took a very different position when asked about Mr. Panetta’s comment during a September 2011 interview with the Financial Times. “The Defense Department, I think in many ways, has been bloated,” he responded. “So I think the Pentagon needs to be pared down.” …

Mr. Hagel was similarly isolated in his views about Iran during his time in the Senate. He repeatedly voted against sanctions, opposing even those aimed at the Iranian Revolutionary Guard Corps, which at the time was orchestrating devastating bomb attacks against U.S. troops in Iraq. Mr. Hagel argued that direct negotiations, rather than sanctions, were the best means to alter Iran’s behavior. The Obama administration offered diplomacy but has turned to tough sanctions as the only way to compel Iran to negotiate seriously.

Mr. Obama has said that his policy is to prevent Iran from obtaining a nuclear weapon and that containment is not an option. Mr. Hagel has taken a different view, writing in a 2008 book that “the genie of nuclear weapons is already out of the bottle, no matter what Iran does.” The former senator from Nebraska signed on to an op-edin The Post this September that endorsed “keeping all options on the table” for stopping Iran’s nuclear program. But Mr. Hagel has elsewhere expressed strong skepticism about the use of force.