Sens. John McCainJohn Sidney McCainSenate's defense authorization would set cyber doctrine Senate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions MORE (R-Ariz.) and Lindsey GrahamLindsey Olin GrahamTop Louisiana health official rips Cassidy over ObamaCare repeal bill Senate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions MORE (R-S.C.) met with President Obama at the White House on Wednesday to discuss national security issues.

It is the second meeting in as many weeks for McCain with the president. Last week, he and Sen. Chuck SchumerCharles (Chuck) Ellis SchumerSenate Dems hold floor talk-a-thon against latest ObamaCare repeal bill This week: Senate wrapping up defense bill after amendment fight Cuomo warns Dems against cutting DACA deal with Trump MORE (D-N.Y.) huddled with the president in the Oval Office to discuss a way forward on immigration reform.

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The meeting also came just a day after Graham told The Hill that the U.S. should consider boycotting the 2014 Winter Olympics in Russia if authorities there decided to offer asylum to Edward Snowden, the former Defense contractor who has claimed responsibility for leaking classified information about top-secret National Security Agency surveillance programs.

White House press secretary Jay Carney would not categorically rule out a boycott on Wednesday, despite admitting he thought it was a bad idea. But Graham stood by his suggestion when talking to reporters yesterday afternoon.

McCain has also played a role in a set of meetings with White House chief of staff Denis McDonoughDenis McDonoughDNC chairman to teach at Brown University Trump mocked Obama for three chiefs of staff in three years Former Obama UN ambassador to meet with Senate Intelligence panel: report MORE and other Republican lawmakers attempting to plot a budget grand bargain, according to reports.

The meeting was not on the president's official schedule.

McCain and Graham have been harsh critics of many of Obama's foreign policy decisions, urging him to do more to aid rebel groups in Syria seeking the ouster of President Bashar Assad and questioning the administration's rapid drawdown of combat forces from Afghanistan.