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Chris Wallace and Sen. Claire McCaskill (D-MO) had a testy exchange on "Fox News Sunday" while discussing allegations of a "pay-to-play" link between the Clinton Foundation and Hillary Clinton's State Department.

McCaskill, one of the first members of Congress to endorse Clinton, said there's no evidence that Clinton ever made any decisions as secretary of state based upon donations to the Foundation.

Wallace pointed out, however, that newly-released emails show one big Foundation donor was able to get a meeting with high-level State Department officials and another was able to secure a position on an advisory board despite having no experience.

"Sen. McCaskill, you don't have a problem with big donors to the Foundation getting favors from the State Department?" Wallace pressed.

McCaskill insisted there is "no evidence" of any pay-to-play or any other criminal activity, despite the fact that Clinton has been the most investigated and scrutinized candidate in the history of U.S. presidential politics.

"Frankly, this is distraction for the Trump campaign, which is a dumpster fire at this point," McCaskill said. "I think they are anxious to try to get people to, 'Look over here, look over here.' Because if you look at what Donald Trump is saying and doing, it is, in many ways, frightening."

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