Sen. Lindsey Graham Lindsey Olin GrahamGraham: GOP will confirm Trump's Supreme Court nominee before the election Fox's Napolitano: Supreme Court confirmation hearings will be 'World War III of political battles' Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee MORE (R-S.C.) said Sunday that if any member of President Trump’s campaign knows about potential collusion with Russia, it is former national security adviser Michael Flynn.

During an interview on CBS’s “Face the Nation,” Graham said that Americans will know “pretty soon” if there was any collusion between Trump’s campaign and Russia, now that Flynn is cooperating with the special counsel’s probe into the allegations.

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“If there was coordination between the Trump campaign and the Russians, I can’t think of a person who would know more about that than Flynn,” Graham said.

As far as potential collusion, Graham said “you’ve found the one person who would know if it did exist,” referencing Flynn.

“So it won’t be long before we understand, one way or the other, whether Trump people colluded with Russia because I can’t imagine it happening and Flynn not know about it,” said Graham.

Flynn last week pleaded guilty to lying to the FBI about his conversations with the Russian ambassador to the U.S.

He is the first former member of the Trump administration to be charged by special counsel Robert Mueller’s probe into Russia’s election meddling and any potential ties between Trump campaign staff and the Kremlin. He has also reportedly agreed to cooperate fully with Mueller's investigation going forward.