Sen. Tom Cotton Tom Bryant CottonRenewed focus on Trump's Supreme Court list after Ginsburg's death Republicans call for DOJ to prosecute Netflix executives for releasing 'Cuties' Loeffler calls for hearing in wake of Netflix's 'Cuties' MORE (R-Ark.) on Sunday dismissed the idea of calling witnesses in the Senate’s impeachment trial of President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE, although he said he did not know whether any of his Republican colleagues would vote to hear additional testimony.

“I’m not going to vote to approve witnesses because the House Democrats have had lots of witnesses … we listened to [House Intelligence Committee Chair] Adam Schiff Adam Bennett SchiffTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies MORE drone on for three days and the president's lawyers, in just two hours demolished the case they had made,” Cotton said on CBS’ “Face the Nation.”

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“They’re not upset that they haven’t had witnesses, they’re upset that their witnesses haven’t said what they want them to say,” he added.

Cotton sparred with CBS’ Margaret Brennan on Trump’s attorney Jay Sekulow Jay Alan SekulowNow, we need the election monitors Judge denies Trump's request for a stay on subpoena for tax records Judge throws out Trump effort to block subpoena for tax returns MORE’s invocation of the conspiracy theory that Ukraine interfered in the 2016 presidential election.

“That’s not a conspiracy theory,” Cotton responded, citing individual Ukrainian officials who had expressed support for Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE and criticism of then-candidate Trump.

Cotton conceded that Ukraine had not engaged in “systematic, top-down” interference sanctioned at the highest levels like Russia, prompting Brennan to respond “you’re being precise in your words and that’s not what the president’s lawyers said.”

Brennan also pressed Cotton on a recording of Trump instructing Rudy Giuliani Rudy GiulianiGrand jury adds additional counts against Giuliani associates Lev Parnas and and Igor Fruman Juan Williams: Breaking down the debates Giuliani criticizes NYC leadership: 'They're killing this city' MORE associate Lev Parnas to “take out” then-U.S. Ambassador to Ukraine Marie Yovanovitch Marie YovanovitchGrand jury adds additional counts against Giuliani associates Lev Parnas and and Igor Fruman Strzok: Trump behaving like an authoritarian Powell backs Biden at convention as Democrats rip Trump on security MORE. Cotton noted that Yovanovitch had been recalled over a year after the recording, indicating that Trump “was not hasty, he was not precipitous” but did not answer Brennan’s questions about Trump’s claims not to have known Parnas before the recording was revealed.