Jason Alexander is slamming President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act 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:

Did the President actually say that the media is responsible for inspiring this bomber to kill Trump critics?Folks, I’m sorry, the President is a disgraceful sub-human. Those who support his behavior, his words have something fundamentally wrong with them. No excuse for Trump. — jason alexander (@IJasonAlexander) October 25, 2018

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 Clinton Hillary Diane Rodham ClintonThe Memo: Trump furor stokes fears of unrest Bloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close MORE and other prominent Democrats. CNN's New York headquarters were evacuated after a package to former CIA Director John Brennan John Owen BrennanJournalism or partisanship? The media's mistakes of 2016 continue in 2020 Comey on Clinton tweet: 'I regret only being involved in the 2016 election' Ex-CIA Director Brennan questioned for 8 hours in Durham review of Russia probe 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 Rohrabacher Dana Tyrone RohrabacherDemocrat Harley Rouda advances in California House primary Lawyers to seek asylum for Assange in France: report Rohrabacher tells Yahoo he discussed pardon with Assange for proof Russia didn't hack DNC email MORE (R).