Republican Sen. Susan Collins Susan Margaret CollinsGraham: GOP will confirm Trump's Supreme Court nominee before the election Gardner signals support for taking up Supreme Court nominee this year Tumultuous court battle upends fight for Senate MORE (Maine) said Sunday that President Trump should refrain from commenting on the special counsel’s Russia probe.

“I understand how difficult and frustrating this investigation is for the president, but he should not say anything further about the special counsel, his staff or the investigation,” Collins told ABC’s “This Week.”

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Collins’s comment comes after President Trump in a wide-ranging interview last week with The New York Times said it would be “a violation” for special counsel Robert Mueller to investigate his finances and his family’s finances outside the realm of the probe into potential ties between his campaign staff and the Kremlin.

“No, I think that’s a violation. Look, this is about Russia,” Trump said in the interview.

Following the interview, Collins said late last week that Trump should “not say another word” about the special counsel’s investigation.

“What the president should do is not say another word and let it go forward,” said Collins, as reported by the Portland Press Herald.