Romney’s comments came in response to Trump’s Friday firing of State Department Inspector General Steve Linick — the latest in a series of dismissals of independent government watchdogs that have come in the wake of the President’s acquittal on two articles of impeachment earlier this year.

“The firings of multiple Inspectors General is unprecedented; doing so without good cause chills the independence essential to their purpose. It is a threat to accountable democracy and a fissure in the constitutional balance of power,” the Utah Republican tweeted.

Romney is the only Senate Republican who voted to convict Trump of abuse of power earlier this year.