Both men have ties to the military and have been the subject of attacks from Donald Trump.  But one is facing a tough reelection, so supporting the Republican nominee is a pledge he stands behind.  Still, Khizr Khan, whose son was killed by a car bomb in Iraq in 2004, wants Sen. John McCain (R-Ariz.) to stand with him in opposition to Trump.  "I implore Sen. McCain ... I continue to implore all of the good Republicans who either support or are going to vote for their party's candidate, this will be a historic moment in the Republican Party," Khan told a local Arizona television station this week, urging McCain to drop his endorsement of Trump.  But McCain, who this fall faces what is perhaps his toughest reelection in more than two decades, has not backed away from his pledge to support his party’s nominee.  This comes even after Trump last summer criticized the war record of McCain -- a veteran of the Navy -- for being captured and held prisoner in Vietnam.  "He's a war hero because he was captured. I like people that weren't captured," Trump said at the time.  During the Democratic National Convention, Khan, with his wife, Ghazala, at his side, delivered an emotional speech about their son’s service and also assailed Trump’s calls to ban Muslims. In the days after, Trump offered public criticisms of the Gold Star family, and in one exchange even suggested that Ghazala Khan’s silence during her husband’s speech was because of her Muslim religion.  Despite many Republicans defecting from Trump after his criticism of Khans, McCain did offer a statement in which he "deeply" disagreed with Trump, but did not withdraw his endorsement.  In Arizona, McCain is faced with a tough reelection as he's being challenged by Democratic Rep. Ann Kirkpatrick, whose district spans much of the northwest part of the state. The most recent polls -- which were conducted in late June -- showed McCain with a five percentage point edge over Kirkpatrick.  Traditionally in presidential elections, Arizona tilts Republican, but Democrats hope to nab the state this election cycle as Latinos -- who are more liberal -- have become an increasingly powerful demographic in the state. And Trump’s comments about Mexican immigrants as "rapists" and drug runners has only helped Democrats and, in turn, hurt Republicans like McCain.  In his interview with the local Arizona station, Khan stressed the importance of the moment.  “If you publicly rebuked him, you will look back and you will stand tall in front of the nation,” he said.
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