Mitt Romney isn’t your average, run-of-the-mill freshman senator from a small state out west. He ran for president as the 2012 Republican nominee; he made a fortune in business; he rescued an Olympic Games effort in Utah; he is a player.

So, when the first-year senator says he wants to hear more from a former national security adviser in the impeachment trial of Donald J. Trump, I believe — it is my hope, at least — that other Republican senators will peel off their blinders and endorse the Romney view of evidentiary transparency.

John Bolton says he is ready to testify if the Senate subpoenas him. The former national security adviser has first-hand knowledge of the “perfect” phone call that Trump said he had with Ukrainian President Volodyrmyr Zelenskiy, the one in which Trump asked Zelenskiy for a “favor, though” before he released military aid to Ukraine in its fight against Russian-backed rebels.

Trump doesn’t want his former national security guru to talk, even though he keeps saying the phone call is “perfect.” It makes many of us wonder: Why does a man with nothing to hide seek to prevent someone who could clear him from talking to the Senate?

Romney wants to hear more from Bolton. There might be another GOP moderate senator or three, or maybe more, who could join Romney in the quest for the truth. If they sign on, then the Senate will hear from at least this witness. Maybe more will be summoned.

Then we can have a “fair” trial in the Senate to determine whether Trump committed an abuse of power and obstructed Congress.