Jason Alexander: Trump a 'disgraceful sub-human' for response to mailed bombs
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Jason Alexander is slamming President TrumpDonald John TrumpJoint Chiefs chairman denies report that US is planning to keep 1K troops in Syria Kansas Department of Transportation calls Trump 'delusional communist' on Twitter Trump has privately voiced skepticism about driverless cars: report 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 ClintonGOP lawmaker defends Chelsea Clinton after confrontation over New Zealand attacks Klobuchar: Race, gender should not be litmus tests for 2020 Dem nominee Kirsten Gillibrand officially announces White House run MORE and other prominent Democrats. CNN's New York headquarters were evacuated after a package to former CIA Director John BrennanJohn Owen BrennanEx-CIA director: 'I don't have any doubt' Trump will pardon Manafort Senate Dems request probe of White House security clearances Brennan calls light Manafort sentence 'extraordinarily lenient' in light of crimes committed 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 RohrabacherProgressives come to Omar's defense Expanding Social Security: Popular from sea to shining sea Oregon Dem top recipient of 2018 marijuana industry money, study finds MORE (R).