CNN's Jim Acosta was repeatedly admonished by Trump as a rude person who should not be working for the network, and he was accused of treating White House press secretary Sarah Sanders and others in a frightful manner.
It's putting out doctored videos attempting to show that this CNN journalist did anything other than resist an attempt to remove the microphone from him - briefly.
The White House Correspondents' Association said it "strongly objects" to the action, calling it "out of line to the purported offense".
"We will not tolerate the inappropriate behaviour clearly documented in this video", Sanders said, posting a video of the CNN reporter allegedly placing his hand on a young woman.
He then berated Acosta for the way he questioned White House press secretary Sarah Huckabee Sanders in briefings.More news: CNN journalist Jim Acosta’s White House access revoked after spat with Trump
During the press conference, several other reporters were the target of Trump's hostility.
The reporter challenged Mr Trump on his characterisation of the South American migrant caravan as an "invasion".
The US president repeatedly interrupted Acosta during the press conference as he attempted to ask questions about the migrant "caravan" and the Russian Federation investigation, and a White House aide attempted to pull the microphone out of Acosta's hand.
Citing Trump's willingness to answer 68 question from 35 reporters at the event, Sanders said that "contrary to CNN's assertions, there is no greater demonstration of the President's support for a free press than the event he held today".
Trump responded: "CNN should be ashamed of itself having you working for them". The way you treat Sarah Huckabee is terrible, and the way you treat other people are awful. "It's a very bad thing you said to me".
Waving his finger, Mr Trump berated him. The White House ought to be more careful, and the administration certainly shouldn't banish reporters for being critical.More news: Nintendo to remove offensive Native American designs from Super Smash Bros. Ultimate
The press secretary doubled down on her comments Thursday afternoon, saying in a press release: "The question is: did the reporter make contact or not?"
When Acosta attempted to return to the White House later on in the day, he was instructed by a secret service member to hand over his press credentials.
'You are a very rude person, ' Trump told him. "You shouldn´t be working for CNN", he said.
After the exchange, CNN, through its public relations department's Twitter feed, said Trump's attacks on the press have gone too far.
In response, Acosta said, "This is a lie". "They are not only risky, they are disturbingly un-American", CNN tweeted after the exchange.
"To say that, what you said, is so insulting to me", he said.More news: Pakistan vs New Zealand - Highlights & Stats
Acosta, 47, regularly grills Sanders at press conferences where she defends Trump's most controversial policies.