Not long after Donald Trump announced his campaign for president, he came under fire for making controversial remarks about Republican Sen. John McCain. In the aftermath of the election, McCain has picked his shots at the new president-elect.

McCain on Trump

"He's not a war hero," Donald Trump said of John McCain just months after launching his campaign for president. Trump was speaking about McCain's service during the Vietnam War, going as far as saying "I like people who aren't captured," a shot at the senator spending time as a POW.

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It took months before McCain eventually endorsed the billionaire real estate mogul following the Republican National Convention, but he ended up pulling his support after the release of the leaked Access Hollywood tape. McCain has since been critical of Trump at times, which continued as reported by The Hill on December 27.

Donald Trump has a made a name for himself by making controversial statements, many of which have caused concern for the national security of the United States. Earlier in the campaign, Trump was highly critical of American NATO allies, stating "We have many NATO members that aren’t paying their bills." Trump has also recently come out against the United Nations, while continuing to defend Russia.

In response, John McCain hit back at Trump while stopping in Estonia. "The best way to prevent Russian misbehavior is by having a credible, strong military and a strong NATO alliance," McCain said.

John McCain, along with Sen. Lindsey Graham, visited the Baltic States, which are now in fear of a Trump administration, due to his apparent relationship with Russian President Vladimir Putin. Despite Trump's praise of Putin, McCain tried to ease tension in the Baltic States by vowing to help keep the current sanctions on Russia. "That is certainly not the case today as I know it," McCain went on to say, in reference to the possibility of lifting the sanctions.

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Feud continues

Not long after Election Day, Donald Trump spoke about the possibility of using waterboarding and torture during international investigations with potential terrorists. McCain, a strong opponent of torture, lashed out at the former host of "The Apprentice," threatening to sue the administration if that practice was brought back. While Trump is less than a month away from officially becoming the president, it appears not every Republican will fall in line with what he wants to get done.