The United States Senate votes to acquit former President Donald Trump for the second time when the 57–43 vote in favor of conviction fails to reach the necessary two-thirds majority. Seven Republicans join the entire Democratic caucus in voting for conviction, making it the closest trial vote since the Andrew Johnson impeachment trial of 1868.
The United States Senate votes 81–13 to override President Donald Trump's veto of the National Defense Authorization Act for Fiscal Year 2021. This is the first successful veto override of the Trump presidency.
The United States Senate votes on whether to acquit U.S. President Donald Trump. By a vote of 52–48 almost entirely along party lines, the Republican-majority Senate acquits Trump on the first article of impeachment, abuse of power, and acquits him on the second charge, obstruction of Congress, in a separate 53–47 vote. Utah Senator Mitt Romney casts the sole Republican guilty vote, against party lines, on the first article.
In an effort led by U.S. Senate Majority Leader Mitch McConnell, Senate Republicans vote 51-48 to approve new Senate rules to limit the in-session debate time for most of President Donald Trump's appointed political nominees to two hours instead of the previously required 30 hours. Senate Republicans invoke the so-called "nuclear option" to approve the new rules, a procedure that allows the Senate to amend rules with a simple majority of 51 votes, rather than the two-thirds supermajority normally required to do so.
The United States Senate rejects "repeal only" propositions of the Patient Protection and Affordable Care Act. United States President Donald Trump lashes out at Republican Senator Lisa Murkowski, who voted against the proposal.
The presidential campaigns of Texas Senator Ted Cruz and Governor of Ohio John Kasich announce they will now coordinate strategies to stop fellow Republican Donald Trump from becoming the party's nominee. Cruz's campaign will cut campaigning in Oregon and New Mexico to help Kasich, while the Kasich campaign will give Cruz a "clear path" in Indiana.
Former New York City mayor Michael Bloomberg is seriously considering a possible independent presidential run if Donald Trump or Texas Senator Ted Cruz face Vermont Senator Bernie Sanders in the general election.