Longtime ABC News White House correspondent Sam Donaldson said Sunday that CNN and its chief White House correspondent, Jim Acosta, are suing the Trump administration over Acosta’s revoked press credentials.

Donaldson, speaking on CNN’s “Reliable Sources,” said that he has been asked to submit an affidavit in the lawsuit in preparation for a court hearing this week.

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The White House pulled Acosta’s hard pass after a tense exchange between him and President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE during a press conference last week.

The White House cited Acosta’s interaction with a press aide as reason to pull the credentials, accusing him of “placing his hands on" her. In return, CNN accused White House press secretary Sarah Huckabee Sanders of “fraudulent accusations."

A CNN spokesperson told The Hill that “no decisions have been made.”

“We have reached out to the White House and gotten no response,” the spokesperson said.

The possible lawsuit comes amid increasingly heated tensions between Trump and the press. In addition to the back-and-forth with Acosta, Trump has clashed with other reporters, and suggested he may pull other press credentials.

The White House faced additional criticism after Sanders shared a video of the interaction that appeared to have been sped up to make it look like Acosta struck the aide. The incident occurred after Trump called Acosta “rude, horrible” person.

Earlier Sunday, White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE admitted the video was sped up, but insisted that increasing the speed was not altering the video.

“That's not altered," she said. “That's sped up. They do it all the time in sports to see if there's actually a first down or a touchdown."

— Updated 1:02 p.m.