Baker called the allegations against Trump a “deeply disturbing situation” and said it was “the proper role and responsibility for Congress at this point is to investigate it.”…

Sen. John Thune (R-S.D.), the No. 2 Senate Republican, told reporters when asked about Trump pressing Ukrainian President Volodymyr Zelensky to help dig up dirt on his potential 2020 opponent that he didn’t “like seeing that.”

“I just think the idea of a conversation like that,” he said. “I know this president operates in different ways … but you know, obviously, like I said before, it’s not something I would bring up. But at least the suggestion about what was proposed there … is still not some place I would go.”

Sen. Mitt Romney (R-Utah), the party’s 2012 presidential nominee, called Trump’s actions “troubling,” Sen. Lisa Murkowski (R-Alaska) said the phone call was “very concerning,” and Sen. Ben Sasse (R-Neb.), after viewing the whistleblower complaint, warned Republicans against “rushing to circle the wagons to say there’s no there there when there’s obviously lots that’s very troubling there.”