Republican Sen. Lamar Alexander of Tennessee, who had been undecided, said late on Thursday that Democrats had proven the case against Trump but that the president's actions did "not meet the United States Constitution's high bar for an impeachable offence".
Sen. Richard Blumenthal of CT said in an interview Friday that calling an end to the impeachment trial could embolden President Donald Trump.
Trump held a rally in Des Moines, Iowa, on Thursday night and slammed the trial, calling it an effort by Democrats to overthrow his 2016 election victory. Republicans accused them of trying to remove the president by force because they know voters would return him to the White House.
House impeachment managers expressed outrage over an assertion by one of Trump's lawyers, Harvard professor emeritus Alan Dershowitz, that a president can do nearly anything he wants if he believes his re-election was "in the public interest".
Other Democrats were looking to Rob Portman of OH, a Trump ally but also the founder of the Senate's Ukraine Caucus and one of the lawmakers who pushed the president to release the frozen military aid to the country.
Trump is only the third president in USA history to be impeached.
Alexander who has announced he will be retiring at the end of his current term, said he still supports President Trump's reelection.
Before Alexander's statement, Republican Sen.
Bolton pushes back on White House book claims, is 'preparing' to testify
Senators have now started to ask questions to Trump's defense team and House managers who effectively act like prosecutors. Cooper said in a statement to news outlets that the council still hasn't gotten back to him about specifics on the review.
Murkowski also said that some of her colleagues in the Senate tried to politicize the trial and attack presiding officer Chief Justice John Roberts.
"What's really going on is he's a threat to them, he's an immediate, legitimate threat to them, he's an immediate legitimate threat to their candidate because the election's only eight months away", said Eric Herschmann, one of the president's attorneys.
In large polling margins, the American public continues to vote for wanting witnesses. Alexander has said he will not be voting for additional witnesses in the trial, although he called the president's conduct toward Ukraine "inappropriate".
Bolton reportedly wrote in a book manuscript that Trump explicitly linked release of military aid to Ukraine in order to get that country's government to announce an investigation of the Bidens, which would have aided the president's re-election campaign by tarnishing one of his chief political rivals.
"I think we can all agree this is a big day", said Senate Majority Leader Mitch McConnell, R-Ky. But ultimately Democrats are not expected to garner the two-thirds majority needed to convict and remove the president. "They just don't want the American people to hear it in all of its ugly, graphic detail".
"I said nothing like that", the retired professor tweeted Thursday.
The lawyer was answering a question from Sen. She told them while the House acted on party lines against Trump, the Senate - "the greatest deliberative body on the planet" - has a new opportunity.
Democrats could try to prolong proceedings with parliamentary maneuvers - a tactic they used last week, delaying approval of the impeachment rules for hours while they forced senators to vote on various motions.
"Our founding documents provide for duly elected presidents who serve with 'the consent of the governed, ' not at the pleasure of the United States Congress. Let the people decide." .