(WASHINGTON) — Republican Sen. Susan Collins of Maine says she’s open to calling witnesses as part of the Senate impeachment trial of President Donald Trump, but she says it is “premature” to decide who should be called until senators see the evidence that is presented. Collins also said it was inappropriate for Senate Majority Leader Mitch McConnell, a Republican, to pledge “total coordination” between the White House and the Senate during the impeachment trial. “It is inappropriate, in my judgment, for senators on either side of the aisle to prejudge the evidence before they have heard what is presented to us,” Collins told Maine Public Radio in an interview Monday. Senators take an oath to render impartial justice during impeachment — an oath lawmakers should take seriously, Collins said. Collins, who is running for reelection and is considered one of the nation’s most vulnerable GOP senators, also faulted Democratic Sen.