Last week, Acosta, who has frequently clashed with Trump and Sanders, got into a heated exchange with Trump during a news conference.
The CNN reporter, known for shouting questions at the USA president and being denied answers, was in Tampa to cover the massive "Make America Great Again" rally there. "He is a very unprofessional guy", Trump said, adding that "I don't think he's a smart person, but he's got a loud voice".
As President Donald Trump watches, a White House aide takes the microphone from CNN's Jim Acosta during a news conference in the East Room of the White House in Washington. Conway asked, after Wallace, who has also criticized Acosta for his actions, gave her a chance to respond to White House critics.
Sanders initially explained the decision by accusing Acosta of making improper physical contact with the intern seeking to grab the microphone.
CNN would seem to be on strong legal ground, said Katie Fallow, senior staff attorney at the Knight First Amendment Institute.
The White House Correspondents' Association said in a statement that it supports CNN's case.
"They don't need to cover a man who is picking fights with them for the goal of turning out his base", [the Democratic strategist] said.
Commenting on the incident, Acosta claimed that he nearly bonded with the pro-Trump demonstrators at the end of the broadcast. "It's what Jim, and all of his colleagues who cover the White House and the administration, do with integrity and professionalism".
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Videos captured Acosta near-surrounded by agitated Trump supporters, whose chants of "CNN sucks" and "traitor" nearly drowned out the CNN broadcast.
The Storyful report also says: "The video shared by Sanders appeared under an hour after the same video, with the same close-up, was posted by Infowars.com contributor Paul Joseph Watson".
"Well, Chris, first of all, what do you mean by "edited" or, as others are saying, "doctored" video?"
"Without this credential, a daily White House correspondent like Acosta effectively can not do his job", CNN's lawsuit said.
Both Acosta and CNN are plaintiffs in the lawsuit, which targets six defendants: Trump, Sanders, White House chief of staff John Kelly, deputy chief of staff William Shine, the Secret Service and its director along with the agent who took the banned journalist's credentials.
"He thinks it's the Jim Acosta show", Watters said Saturday. "We have reached out to the White House and gotten no response".
Several journalists and organizations - including the American Society of News Editors, the Associated Press Media Editors and the Online News Association - demanded Acosta's press pass be reinstated. "This is just more grandstanding from CNN, and we will vigorously defend against this lawsuit", Sanders said.
"The First Amendment is not served when a single reporter, of more than 150 present, attempts to monopolize the floor", the press secretary said in a statement. President Trump repeatedly tried to move on to another reporter. The president has a long history of insulting the intelligence of women and people of color.