President Obama slammed Republican nominee Donald Trump as "unfit" and "woefully unprepared" to be president during a news conference with Singapore's prime minister at the White House on Tuesday. Pablo Martinez Monsivais/AP hide caption

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Pablo Martinez Monsivais/AP

NPR's Steve Inskeep interviews Speaker of the House Paul Ryan in the Speaker's conference room at the U.S. Capitol in Washington, D.C. Ariel Zambelich/NPR hide caption

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Ariel Zambelich/NPR

House Speaker Paul Ryan of Wisconsin meets with reporters on Capitol Hill in Washington on Thursday after his meeting with Republican presidential candidate Donald Trump. Cliff Owen/AP hide caption

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Cliff Owen/AP

Republican presidential candidate Donald Trump arrives for a meeting with House Speaker Paul Ryan at the Republican National Committee Headquarters on Capitol Hill Thursday. Andrew Harnik/AP hide caption

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Andrew Harnik/AP

President Obama said he regrets that the rancor between the parties has grown during his watch. "I guarantee I'll keep trying to be better so long as I hold this office," he said. Susan Walsh/AP hide caption

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Susan Walsh/AP

House Speaker Paul Ryan, R-Wis., during his end-of-year news conference. J. Scott Applewhite/AP hide caption

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J. Scott Applewhite/AP

"My goal is to help unify the conservative movement."

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At a news conference following a closed-door GOP caucus meeting, Speaker of the House Paul Ryan, R-Wis., dismisses Republican presidential candidate Donald Trump's comments on Muslims. J. Scott Applewhite/AP hide caption

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J. Scott Applewhite/AP

Sen. Ted Cruz, R-Texas, is among a hand of Republican Presidential candidates to weigh in on the shooting at a Colorado-based Planned Parenthood clinic over the weekend. John Raoux/AP hide caption

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John Raoux/AP

"This is the loneliest place in the world," House Speaker John Boehner said on the eve of his resignation. Alex Brandon/AP hide caption

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Alex Brandon/AP

"Just a regular guy"

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House Speaker John Boehner vowed to "clean the barn" before he stepped down. And he's doing just that with a budget deal that also raises the debt ceiling. Robert Giroux/Getty Images hide caption

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Robert Giroux/Getty Images