“I think that he knows now that, if he is trying to do certain things, whether it’s ferreting out corruption there, in Afghanistan, whatever it is, he needs to go through the proper channels,” the Iowa Republican said on CNN’s “State of the Union.”

To root out corruption in Ukraine, she added, the president should have instead gone to the Justice Department and other international organizations for help, but instead “chose to go a different route.”

Later, Ernst said she intends to vote for Trump’s acquittal.