Lindsey Graham called for former Attorney General Loretta Lynch and current Attorney General Jeff Sessions to testify before the Senate Judiciary Committee. | Getty Graham: Trump could 'go down' because of 'inappropriate' statements

Sen. Lindsey Graham suggested on Sunday that President Donald Trump could be brought down because of his “inappropriate” statements about the investigation into whether his campaign colluded with Russia.

Appearing on CBS’ “Face the Nation,” the South Carolina Republican said revelations about Trump's conversations with former FBI Director James Comey about the Russia probe don't amount to "obstruction of justice.”

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“Now, what the president did was inappropriate,” Graham said. “But here's what's so frustrating for Republicans like me. You may be the first president in history to go down because you can't stop inappropriately talking about an investigation that if you just were quiet, would clear you.”

The senator also called for former Attorney General Loretta Lynch and current Attorney General Jeff Sessions to testify before the Senate Judiciary Committee, based on Comey’s testimony implying they were “playing politics” with federal investigations.

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“That needs to be in our committee,” Graham said. “Let me tell you this, to the American people. If the attorney general's office has become a political office, that's bad for us all. So, I want to get to the bottom of that, and it should be in Judiciary.”

Comey testified Thursday before the Senate Intelligence Committee that Lynch had asked him to refer to his probe into Hillary Clinton’s emails as a “matter” rather than an investigation. He also raised questions about Sessions’ relationship with Russian diplomats.