Jason Alexander: Trump a 'disgraceful sub-human' for response to mailed bombs
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Jason Alexander is slamming President TrumpDonald John TrumpJulián Castro: It's time for House Democrats to 'do something' about Trump Warren: Congress is 'complicit' with Trump 'by failing to act' Sanders to join teachers, auto workers striking in Midwest MORE's response to the attempted bomb attacks on prominent Democrats, calling the commander in chief a "disgraceful sub-human."

The former "Seinfeld" star wrote to his nearly half a million Twitter followers on Thursday:

The 59-year-old actor's tweet came hours after Trump suggested on Twitter that the "fake news" media was at least partly to blame for political hostility across the country, writing, "A very big part of the Anger we see today in our society is caused by the purposely false and inaccurate reporting of the Mainstream Media that I refer to as Fake News."

A day earlier, Trump called the mailed explosive devices "abhorrent," promising to "get to the bottom" of them.

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Explosives were sent this week to former President Obama, 2016 Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonMissing piece to the Ukraine puzzle: State Department's overture to Rudy Giuliani On The Money: Trump downplays urgency of China trade talks | Chinese negotiators cut US trip short in new setback | Trump sanctions Iran's national bank | Survey finds Pennsylvania, Wisconsin lost the most factory jobs in past year Meghan McCain, Ana Navarro get heated over whistleblower debate MORE and other prominent Democrats. CNN's New York headquarters were evacuated after a package to former CIA Director John BrennanJohn Owen BrennanTrump lashes out at former intel officials for criticism of Iran tweet Trailer shows first look at Annette Bening as Dianne Feinstein Webb: Questions for Robert Mueller MORE, an MSNBC contributor who has appeared on CNN, was flagged there.

All of the public figures who were on the receiving end of the packages have been the subjects of harsh criticism from Trump.

Authorities have not yet identified a motive or suspect. 

It's not the first time Alexander has weighed in on politics. The performer appeared in a campaign video for California Democrat Harley Rouda, who's running against Rep. Dana RohrabacherDana Tyrone RohrabacherThe Hill's Morning Report - Trump, Biden go toe-to-toe in Iowa Ex-GOP lawmakers are face of marijuana blitz Former GOP Rep. Rohrabacher joins board of cannabis company MORE (R).