Former CIA Director John Brennan fired back Thursday at President Trump’s attack on the media, calling for him to “act Presidential” instead of encouraging physical violence with his rhetoric.

“Stop blaming others. Look in the mirror. Your inflammatory rhetoric, insults, lies, & encouragement of physical violence are disgraceful. Clean up your act....try to act Presidential. The American people deserve much better,” Brennan posted to Twitter Thursday morning. “BTW, your critics will not be intimidated into silence.”

[READ: Pipe bombs scare: Here's what we know]

A suspicious package containing a “potentially explosive device” was addressed to Brennan and arrived at CNN offices in New York City Wednesday morning, causing the building to be evacuated.

Brennan responded Wednesday night to the multiple bomb threats and suspicious packages, saying that he hoped it would be a “turning point” that would spark Trump to change his rhetoric toward the media and his political opponents.

On Thursday morning, Trump tweeted that the media was to blame for the rising “anger” in America.

At least nine packages have been found this week that were addressed to prominent Democratic figures and Trump critics, including former President Barack Obama, Bill and Hillary Clinton, former Vice President Joe Biden, multiple Democratic members of Congress, Democratic mega-donor George Soros, and vocal Trump critic Robert De Niro.