When a White House intern attempted to take the microphone from Acosta three times, he held onto it and continued questioning Trump. As a female aide attempts to take the microphone away, Acosta brushes her aside.
The White House has banished CNN's top political reporter from the building after accusing him of assaulting an intern during a fiery press conference with President Donald Trump. Among the critics was a CNN executive who called it "a doctored video - actual fake news".
"We stand by our decision to revoke this individual's hard pass". She did not say to whom she was referring, but the implication was that it was Acosta.
Despite the video's dubious origins, Sanders doubled down in a White House statement on Thursday saying "The question is: did the reporter make contact or not?"
Watch video of the full, unedited, exchange at the top of this article. However, an analysis of the video by Storyful found that Sanders' video had been altered from the original footage.
CNN showed the clip but edited out the part where he clearly touched her.
US President seemed to walk out as the reporter clung to the microphone and persisted with questions about the president´s views on a caravan of Central American migrants making its way to the US border.
Crucially, however the video appears to have been doctored.
The decision to expel Acosta came just hours after confirmation that the Republican Party had lost control of the US House of Representatives on Wednesday. "Secret Service just informed me I can not enter the WH grounds for my 8pm hit".
White House correspondent Jim Acosta.
The White House Correspondents Association (WHCA) also said such a decision is "unacceptable" and urged the White House that it "immediately reverse its decision". "We encourage anyone with doubts that this reaction was disproportionate to the perceived offense to view the video of events".
The sparring started after Acosta asked Trump about the caravan of migrants heading from Latin America to the southern USA border.
"Honestly, I think you should let me run the country and you run CNN", Mr Trump snapped, adding "and if you did it well, you're ratings would be much better".
In a statement Wednesday night, CNN said that Sanders "provided fraudulent accusations and cited an incident that never happened".