The White House does not want to see a prolonged impeachment trial in the U.S. Senate, a senior administration official said on Sunday, suggesting President Donald Trump is comfortable with proceeding without calling witnesses in his defense.

The Democratic-led House of Representatives approved two impeachment charges against Trump on Wednesday over his pressuring of Ukraine to investigate a political rival. There is little chance he will be convicted and removed from office through a trial in a Senate controlled by fellow Republicans.

Democrats are pressing to call top Trump aides to testify, but Senate Majority Leader Mitch McConnell wants the Senate to consider the case without hearing from new witnesses.