Former national security adviser Michael Flynn will make his first public appearance since taking a plea deal in special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's investigation, campaigning for a GOP challenger to Rep. Maxine Waters Maxine Moore WatersPelosi: House will stay in session until agreement is reached on coronavirus relief Omar invokes father's death from coronavirus in reaction to Woodward book Business groups increasingly worried about death of filibuster MORE (D-Calif.) on Friday in California.

ABC News reports Flynn is expected to make remarks and give an endorsement at a campaign event Friday night for Omar Navarro, a Republican running to unseat Waters.

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"He's endorsing me," Navarro told ABC News. "We talked to each other for two hours. We got along really well."

In early December, Flynn became the first Trump administration official to enter a guilty plea in the ongoing investigation by the special counsel's office into President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE and Russia's election meddling. Flynn has faced financial issues over the case, putting his home up for sale to cover his legal fees.

As part of a plea agreement, Flynn agreed to cooperate fully with Mueller's investigation, which has so far ensnared several former members of the Trump campaign, including former Trump campaign chairman Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE, former Trump campaign aide Richard Gates and Trump foreign policy adviser George PapadopoulosGeorge Demetrios PapadopoulosTale of two FBI cases: Clinton got warned, Trump got investigated Trump says he would consider pardons for those implicated in Mueller investigation New FBI document confirms the Trump campaign was investigated without justification MORE, among others.

Navarro rejected the idea that Flynn's role in the Mueller investigation would loom over the endorsement.

“I was very happy” to receive Flynn's endorsement, Navarro said, “because I have a lot of respect for the man. It was an honor and it’s great to have the support for my campaign.

“I’m more than honored to have his endorsement.”

Navarro faces a difficult campaign against Waters, who beat him in 2016 by more than 50 points.