John Mccain

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Sen. John McCain supposed aviator's suit, helmet and parachute are exhibited in a glass case at "the Hanoi Hilton."

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FILE - In this Feb. 5, 2015, file photo, Senate Armed Services Committee Chairman John McCain, R-Ariz., speaks on Capitol Hill in Washington. McCain has announced he will run for re-election in 2016. The Arizona Republican made the announcement to run for a sixth term on Monday, April 6, 2015. (AP Photo/J. Scott Applewhite, File)

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FILE - In this Feb. 5, 2015, file photo, Senate Armed Services Committee Chairman John McCain, R-Ariz., speaks on Capitol Hill in Washington. Republicans hammering the Obama administration about nuclear talks with Iran are accusing President Barack Obama of being so keen to strike a deal that he’s ignored Iranian moves to expand its influence across the Middle East. "The Iranians are now in Sanaa. They’re in Baghdad and Beirut and Damascus and meanwhile this president and secretary of state pursue the mirage of a nuclear agreement," McCain said in a recent speech. (AP Photo/J. Scott Applewhite, File)

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Senate Armed Services Committee Chairman John McCain, R-Ariz., speaks to reporters as he heads to the chamber for a procedural vote at the Capitol in Washington, Monday, March 2, 2015. (AP Photo/J. Scott Applewhite)

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U.S. Sen. John McCain blasted the president's "more of the same" strategy for Ukraine and described it as "doomed to fail." (AP Photo/Matthias Schrader)

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Senate Armed Services Chairman John McCain, Arizona Republican, told CNN on Wednesday that King Abdullah, who met with senators while in Washington, is frustrated by a "huge bureaucratic bottleneck in the State Department." "He needs some types of weapons very badly," Mr. McCain said. "We'll be working immediately to try and achieve that for him." (Associated Press)

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Senate Armed Services Committee Chairman Sen. John McCain, R-Ariz., bangs the gavel to start a committee hearing on Capitol Hill in Washington in this Jan. 21, 2015, file photo. (AP Photo/Cliff Owen, File)

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Senate Armed Services Committee Chairman John McCain, R-Ariz., gathers a bipartisan group of senators to call on President Barack Obama to provide defensive weapons to Ukraine to fight Russian-backed rebel groups and to stave off incursions from Russia and Ukrainian separatists, during a news conference on Capitol Hill in Washington, Thursday, Feb. 5, 2015. (AP Photo/J. Scott Applewhite)

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Senate Armed Services Committee Chairman John McCain got fed up with protesters during a hearing on Thursday, telling them to "get out of here, you low-life scum." (CNN)

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Senator John McCain. (AFP PHOTO/POOL/MANDEL NGAN)

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Sen. John McCain, Arizona Republican, has warned that Iran is "on the march" in the Middle East. (AP Photo/The Arizona Republic, David Wallace)

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US Senator John McCain (R-AZ) arrives for US President Barack Obama's State Of The Union address on January 20, 2015 at the US Capitol in Washington, DC. AFP PHOTO/POOL/MANDEL NGAN

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Senate Armed Services Committee Chairman Sen. John McCain, R-Ariz., bangs the gavel to start the committee's hearing to examine global challenges and U.S. national security strategy, Wednesday, Jan. 21, 2015, on Capitol Hill in Washington. (AP Photo/Cliff Owen)

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Image: Twitter, John McCain

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Sen. John McCain, R-Ariz., listens to questions from reporters on Capitol Hill in Washington, Friday, Dec. 12, 2014. (AP Photo/Manuel Balce Ceneta) ** FILE **

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The Republican takeover of the Senate may pave the way for Sen. John McCain (left) and other GOP foreign policy hawks like Sen. Lindsey Graham to try to play "back-seat driver" to the White House, but at the end of the day, "if the president doesn't want to do what they push for, that's entirely up to him," said one senior congressional aide. (Associated Press)

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Sens. John McCain (left) and Marco Rubio (right), and Sen. Lindsey Graham — who all collaborated with Mr. Obama and Democrats last year to pass a broad legalization bill in the Senate — said in a letter that the president lacks the legal authority to act on his own. (Associated Press)

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Senate Armed Services Committee members Sen. John McCain, Arizona Republican, and Sen. Kelly Ayotte, New Hampshire Republican, have criticized the Air Force's decision to retire the A-10 Warthogs in favor of keeping the B-1B aircraft in play as the A-10s are the only aircraft specifically devoted to close air support. Mr. McCain, himself a former Air Force pilot, was incensed upon first learning of the A-10's retirement.