Former Trump campaign adviser George Papadopoulos arrives at a closed-door hearing before the House Judiciary and Oversight Committee October 25, 2018 at the Rayburn House Office Building on Capitol Hill in Washington, DC.

George Papadopoulos, a former campaign advisor for President Donald Trump, is planning to run for the California House seat soon to be vacated by Rep. Katie Hill.

Papadopoulos, who was a foreign policy advisor for Trump during his 2016 campaign for president, served 12 days in prison after pleading guilty to lying to the FBI during special counsel Robert Mueller's investigation into possible links between the campaign and Russia's interference in the 2016 election.

Papadopoulos became a key figure in the Mueller probe after the FBI learned of a meeting he had with a Russian intermediary who offered him "dirt" in the form of thousands of Hillary Clinton's emails.

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Papadopoulos filed paperwork on Tuesday with the Federal Election Commission indicating he will run for the seat. He will run as a Republican in the swing district, California's 25th, which had been in GOP hands for 26 years before Hill flipped the seat in the 2018 midterm elections as part of the blue wave that propelled Democrats to a House majority.

A campaign website on Tuesday asked supporters to "help fight back against Democrat corruption by joining George's campaign today," according to BuzzFeed. That website was no longer active Wednesday.