67 senators would need to vote in favor of it, a move that would require 20 Republicans to join with the 47-member Democratic caucus and break with the president.

Senate Republicans, however, still intend to hold a trial and do not plan to dismiss the articles outright, partly because they don’t have the votes to do so. In order to table the articles, lawmakers would need 51 votes, a majority that counts on nearly every Republican voting in favor of this action.

…The 100 lawmakers of the Senate will be sworn in as “jurors” who will hear the evidence presented by both sides; some lawmakers have used this role as a reason for declining to comment on the ongoing inquiry, arguing that they do not want to offer judgments before participating in the trial. Chief Justice John Roberts will preside over the trial, and both sides will have the opportunity to call witnesses, request documents, and present arguments.

On behalf of House lawmakers bringing the impeachment charges, House representatives and their associated counsel are poised to serve as prosecutors, also known as “managers.” Trump’s counsel, meanwhile, will defend him.

Senate impeachment trial: Lawmakers would vote on potential charges Trump faces – Vox

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