Sen. Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally Gideon leads Collins by 12 points in Maine Senate race: poll Senate leaders quash talk of rank-and-file COVID-19 deal MORE (R-Maine) on Wednesday acknowledged that her stated belief that President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE had learned a lesson from impeachment was "aspirational," saying that she "may not be correct on that."

Speaking on Fox News following the Senate's vote to acquit Trump, Collins said that her previous comments stemmed from a hope that the president would listen to the several Republican senators who said his behavior was "problematic."

"I hoped that the president would’ve learned from the fact that he was impeached by the House," Collins said, adding that parts of Trump's July 25 phone conversation with Ukrainian President Volodymyr Zelensky were "wrong."

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The call was at the center of the House's inquiry into Trump's alleged efforts to get Ukraine to open investigations into his political rivals.

"The president [asked a] federal government to investigate a political rival. And he should not have done that. And I would hope that he would not do it again," she said.

Asked if she received any assurances from Trump about his future conduct, Collins said that she had not spoken with Trump throughout the Senate trial. When pressed on why she believed he'd a learned a lesson, then, Collins said, "Well, I may not be correct on that."

In announcing her intention to vote to acquit Trump earlier this week, Collins justified her position by stating that the president had learned a "pretty big lesson" from impeachment and that he would be "much more cautious in the future."

Asked about Collins's comments ahead of the State of the Union address on Tuesday, Trump reportedly said that he'd done nothing wrong, adding, “It was a perfect call."

The Senate concluded its trial of Trump by voting to acquit him on charges of abuse of power and obstruction of Congress. Sen. Mitt Romney Willard (Mitt) Mitt RomneyThe Memo: Warning signs flash for Trump on debates GOP votes to authorize subpoenas, depositions in Obama-era probe Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' MORE (Utah) was the only Republican to join the 47 Democratic senators and vote to convict Trump for abuse of power.

Trump tweeted early Thursday that impeachment was "just a continuation of the Radical Left, Do Nothing Democrats corrupt practices!" He is scheduled to give an address from the White House later Thursday afternoon.