The scandal surrounding Donald Trump and Russia increases on an almost daily basis, and even some Republicans are not pleased with it. While the administration continues to deny any wrongdoing, Arizona Sen. John McCain has decided to voice his opinion.

McCain on Trump

Not long after Donald Trump announced his campaign for president, rumors circulated that he had ties back to Russia. Trump has denied the allegations, despite evidence being released that links himself, and past and current associates, back to the Kremlin. Around the same time the earlier Trump-Russia rumors started, Trump delivered his first criticism of John McCain, mocking the senator for being captured and becoming a POW during the Vietnam War.

Since that time, Trump's relationship with the senator of Arizona has been rocky at best, with a clear difference of opinion on the topic of Russia. During a March 31 interview with CNN, McCain elaborated further on his thoughts about the issue at hand.

(McCain's comments on Trump and Russia start at 3:20 in the above video.)

Sitting down with CNN contributor David Axelrod was John McCain, and the 2008 Republican presidential nominee didn't hold back his views on Donald Trump's recent comments about Russia and Vladimir Putin. McCain spoke about a remark that was made by Trump during a recent Fox News interview where the former host of "The Apprentice" brushed off the claim that Putin was a "killer." "We've got a lot of killers," Trump said, before adding, "What, do you think our country's so innocent?"

In response, John McCain fired back.

"To state that there is some moral equivalency between an imperfect nation, that's the United States of America, and Vladimir Putin is appalling," McCain said of Trump.

Next up

This isn't the first time that John McCain has been critical of Donald Trump or Russia. McCain has routinely referred to Vladimir Putin as a "murder" and a "thug," and whose criticism doesn't look to be slowing down anytime soon.

In addition, not long after Trump was elected, McCain threatened to sue the president if he moved forward with his plan to reinstate the use of waterboarding to extract information from suspected terrorists.