In highly charged and notably ominous terms, Sen. Jeff Flake (R-AZ) on Wednesday laid bare his fears about the damage Donald Trump was inflicting on the office he holds, and called out his fellow Republicans for lacking the spine to fight to it.

“Our presidency has been debased by a figure who has a seemingly bottomless appetite for destruction and division and only a passing familiarity with how the Constitution works,” Flake declared, according to an advanced copy of the commencement address he was delivering to graduates of the Harvard School of Law. “And our Article I branch of government, the Congress is utterly supine in the face of the moral vandalism that flows from the White House daily.”

Flake’s rebukes of Trump are hardly new. Since announcing his retirement from Congress, he has been one of a handful of vocal Republican critics of the president, even going to the well of the Senate to deliver his broadsides.