Sen. Susan Collins Susan Margaret CollinsSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (Maine), a leading moderate Republican voice, on Sunday said that passing a bill to protect Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE would send a “very strong message” to President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE not to interfere in the special counsel's investigation.

Collins said on ABC's "This Week" that she doubts Trump would sign such a bill into law and, like other moderate Republicans, has questions about its constitutionality, as it would infringe on the president’s power to make personnel decisions.

Collins, however, indicated she might support the bill as a pointed warning to Trump not to fire senior Department of Justice officials with oversight of Mueller’s investigation or otherwise meddle with his probe on possible collusion with Russia during the 2016 election.

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“It would not hurt if we passed legislation to send a message to the White House that we want the investigation to continue,” Collins said.

Collins warned the bill has flaws, as “the president is never going to sign the legislation” and it raises “some legitimate constitutional concerns.”

But she said it could be worth debating and passing anyway.

“Having the discussion in Congress helps send a very strong message that we do not want Mr. Mueller’s investigation interfered with in any way,” she said.

Republican lawmakers have repeatedly dismissed the possibility that Trump might terminate Mueller but they’ve grown increasingly alert to the possibility in recent days after the FBI raided the home, office and hotel room of the president's longtime personal attorney, Michael Cohen.

Trump heightened their concerns last week when White House press secretary Sarah Huckabee Sanders told reporters that the president “certainly believes he has the power” to fire Mueller.

Collins has argued that only Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE, who has oversight of Mueller’s investigation, can dismiss Mueller, and believes she has assurances from Rosenstein that he would not do so.

Collins last week warned of serious repercussions if Trump instead sacked Rosenstein to put pressure on Mueller.

“If the president were to fire the deputy attorney general, that would be an extraordinary crisis and a real problem and I just don't think he's going to do it," she told reporters.