First impeachment trial of Donald Trump
There were many witnesses who wished to testify before the Senate. The Senate voted on whether or not to allow witnesses to testify. Fifty-one votes were required to allow witnesses. There were 47 Democrats* and 53 Republicans in the Senate. All the Democrats* voted to allow witnesses to testify. Of the Republicans, Mitt Romney from Utah and Susan Collins of Maine voted to allow witnesses. This did not meet the required number of votes, and so no witnesses were allowed to testify.