Horror and science fiction writer Stephen King tore into President Trump Donald John TrumpREAD: Cohen testimony alleges Trump knew Stone talked with WikiLeaks about DNC emails Trump urges North Korea to denuclearize ahead of summit Venezuela's Maduro says he fears 'bad' people around Trump MORE after he attacked San Juan Mayor Carmen Yulin Cruz in the wake of Hurricane Maria’s devastation in Puerto Rico.

“Donald Trump, the master of self-congratulation. His picture should be next to NARCISSIST in the dictionary,” King tweeted Saturday.

Donald Trump, the master of self-congratulation. His picture should be next to NARCISSIST in the dictionary. — Stephen King (@StephenKing) September 30, 2017

King is a frequent Trump critic, once calling him "unfit for office."

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He claimed in June that Trump had blocked him on Twitter, and said in August that he was blocking Trump from seeing his movies in return.

King’s comments come after Trump sent out a series of tweets earlier Saturday going after Cruz for her “poor leadership” in the wake of the storm.

The Mayor of San Juan, who was very complimentary only a few days ago, has now been told by the Democrats that you must be nasty to Trump. — Donald J. Trump (@realDonaldTrump) September 30, 2017

...Such poor leadership ability by the Mayor of San Juan, and others in Puerto Rico, who are not able to get their workers to help. They.... — Donald J. Trump (@realDonaldTrump) September 30, 2017

...want everything to be done for them when it should be a community effort. 10,000 Federal workers now on Island doing a fantastic job. — Donald J. Trump (@realDonaldTrump) September 30, 2017

He doubled down on that criticism in a tweet later Saturday, saying the results of the relief efforts will "speak much louder than complaints by San Juan Mayor."

Results of recovery efforts will speak much louder than complaints by San Juan Mayor. Doing everything we can to help great people of PR! — Donald J. Trump (@realDonaldTrump) September 30, 2017

Cruz had held an emotional press conference Friday, pleading for more hurricane and relief assistance from the federal government.