From Wikipedia--Trump Impeachment-2.0

At the beginning of the trial, Senator Rand Paul forced a vote to dismiss the impeachment charge on the basis that it was unconstitutional to try a former president, arguing that impeachment only applies to current federal officers and that the punishment of removal from office was moot under the circumstances. Supporters of proceeding with the trial argued that the Constitution also permits disqualification from holding future office, which the House had requested in its article of impeachment. The motion was defeated in a 55–45 vote, with all Democrats, both independents, and five Republicans (Susan Collins of Maine, Lisa Murkowski of Alaska, Mitt Romney of Utah, Ben Sasse of Nebraska, and Pat Toomey of Pennsylvania) voting against the motion.[60][61] This was the first time that a former president had been tried, and only the second time the Senate tried someone who had already left office, after Secretary of War William W. Belknap in 1876. Jamie Raskin was the lead impeachment manager and the primary author – along with Representative David Cicilline and Representative Ted Lieu – of the impeachment article, which charged Trump with inciting an insurrection by sparking the Capitol attack. Joaquin Castro, Eric Swalwell, Madeleine Dean, and Stacey Plaskett also assisted in delivering the oral arguments for conviction.

Trump's defense was led by Michael van der Veen, a personal injury lawyer from Philadelphia, along with David Schoen and Bruce Castor. Van der Veen's style and substance during the trial drew ridicule and criticism from many, with gasps and laughter in the Senate when he stated that he would seek to depose at least 100 people at his Philadelphia office, including Speaker of the House of Representatives Nancy Pelosi and Vice President Kamala Harris.[62][63] Trump had originally hired Butch Bowers and Deborah Barbier to represent him, but they quit along with three other lawyers after "the former president wanted the lawyers representing him to focus on his allegations of mass election fraud" and his false claim that "the election was stolen from him."[64]

At the conclusion of the trial, the Senate voted 57–43 to convict Trump of inciting insurrection, falling 10 votes short of the two-thirds majority required by the Constitution, and Trump was therefore acquitted. Seven Republican senators joined all Democratic and independent senators in voting to convict Trump, the largest bipartisan vote for an impeachment conviction of a U.S. president or former U.S. president.[65][66] After the vote on the acquittal, Mitch McConnell said, "There's no question that President Trump is practically and morally responsible for provoking the events of the day."[67] but he voted against conviction due to his interpretation of the United States Constitution.[68]