Former CIA Director John Brennan reacted to President Donald Trump’s press conference with Russian President Vladimir Putin by calling on Republican lawmakers to support impeaching the president.

“Donald Trump’s press conference performance in Helsinki rises to & exceeds the threshold of ‘high crimes & misdemeanors,’ Brennan wrote, hinting at impeachment proceedings.

Brennan is a frequent Trump critic and a contributor for NBC/MSNBC.

“It was nothing short of treasonous. Not only were Trump’s comments imbecilic, he is wholly in the pocket of Putin,” he continued. “Republican Patriots: Where are you???”

During the press conference with Putin, Trump questioned the FBI investigation of Hillary Clinton’s use of a private email server and their failure to seize the DNC’s server that they claimed was hacked by Russians.

Later in the day, Brennan appeared on MSNBC to call for Trump officials to resign.

“I cannot understand how the national security team can continue to abide by this and how Pompeo and Bolton and Kelly can continue in their jobs,” he said. “This, I think, rises to the point of good American patriots resigning in objection to that performance by Donald Trump.”