SurveyUSA asked 4,096 registered voters whether witnesses with firsthand knowledge should be allowed to testify, with 71 percent of Republicans, 93 percent of Democrats, and 81 percent of Independents saying witnesses should be allowed to testify. Only 15 percent of Republicans said that they should not be allowed to testify, while 4 percent of Democrats, and 7 percent of Independents said they shouldn’t. Only 3 percent of Democrats were unsure, with 12 percent of Independents and 14 percent of Republicans answering not sure…

The survey also asked what the Senate should do if Trump’s team tries to prevent witnesses from testifying. Republicans were a little more evenly split on this issue, with 32 percent saying that the Senate should “yield to the president and reach a verdict without the witness’ testimony.” Another 27 percent said they should insist the witness testify and 25 percent said they should seek the Supreme Court’s intervention. The majority of Democrats, or 63 percent, said that Senate should insist that witnesses testify, while 30 percent said the Supreme Court should intervene and only 5 percent said the Senate should yield. More Independents than Democrats and Republicans said the Senate should ask the Supreme Court to intervene with 33 percent, while 44 percent said they should insist on witnesses testifying and 12 percent said they should yield.