In December, Flynn pleaded guilty to lying to the FBI about conversations with the Russian ambassador before president-elect Trump took office. Flynn faces one count of lying to federal authorities and his sentencing hasn't been set yet pending his successful cooperation with Mueller's investigation.

Navarro challenged Waters in 2016 and received 24 percent of the vote to her 76 percent.

The 43rd Congressional District is rated by the Cook Political Report as plus-29 for Democrats and considered a safe seat for the party.

Flynn targeted Democrats in general in his speech, rattling off and criticizing labels such as liberal, left and progressive.

\"It's a dangerous thing to put these labels on something to make it sound cool, but it really isn't. It really isn't,\" Flynn said. \"My judgment, they have trained a generation of young people to remain poor while blaming the rich, and to remain obsessed over the past while blaming those of us who are optimistic for the future. Blame, blame, blame. What a miserable existence. I don't know how you can get up everyday and feel that way. God, it's like, quit whining.\"

Navarro spent his time on Twitter Friday evening retweeting all of the various news stories about his endorsement by Flynn.

Navarro has not been endorsed by the California Republican Party.

ABC News' Mark Osborne contributed to this report.

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