Trump fired off a pair of tweets attacking Post reporter Dave Weigel over a "phony photo" of an empty arena ahead of his Friday rally in Pensacola, Florida.
The trouble started early Saturday morning after Trump tweeted that the arena he had spoken in the night before in Pensacola "was packed to the rafters", the Washington Post reports. "Demand apology & retraction from FAKE NEWS WaPo!" the president wrote, including pictures of the venue's seats filled as he was onstage.
"Sure thing - I apologize", he tweeted.
Weigel owned up to the error, saying he deleted the tweet after a Daily Mail reporter spotted his mistake.
President Trump ripped into CNN and The Washington Post yesterday, claiming the network was caught "red-handed" making a "vicious and purposeful mistake" and calling for one of the newspaper's reporters to be fired for publishing a misleading picture of the president's latest campaign rally.
"Very little discussion of all the purposely false and defamatory stories put out this week by the Fake News Media".
"The president replied: "@daveweigel of the Washignton Post just admitted that his picture was a FAKE (fraud?) showing an nearly empty arena last night for my speech in PEnsacola when, in fact, he knew the arena was packed (as shown also on T.V.).
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Other reported posts by Weigel in 2010 include him writing that conservative blogger Matt Drudge should "handle his emotional problems more responsibly and set himself on fire". "And when he was later addressed by the president on Twitter, he promptly apologized for it", the post's VP of communications Kristine Coratti Kelly said. "Packed to the rafters", Weigel wrote sarcastically.
"CNN'S slogan is CNN, THE MOST TRUSTED NAME IN NEWS".
Mr Trump has locked horns with the press on numerous occasions, repeatedly accusing large sections of the media of producing "fake news" - particularly in relation to the Russian Federation investigation.
"Take a moment and follow @daveweigel, a great reporter and a fantastic guide to this political age", David Fahrenthold said on Twitter.
"You should have been apologizing for the last two years", Trump added as the audience cheered.
You can always count on President Trump to bash the media, whether the reporting is accurate.