Former Trump campaign chairman Paul Manafort is suing the Department of Justice and special counsel Robert Mueller over the investigation into his alleged business ties with Russia.

The lawsuit, which was filed in the United States District Court in Washington, D.C., names the DOJ, Acting Attorney General Rod Rosenstein and Mueller. It claims the probe into Manafort “has extended far beyond ‘links and/or coordination between the Russian government and individuals associated with the campaign of President Donald Trump.’”

The suit adds that Mueller exceeded his authority by focusing on Manafort’s “offshore business dealings that date back to as early as 2005 — about a decade before the Trump presidential campaign launched.”

Manafort resigned from President Donald Trump’s campaign in August of 2016 amid scrutiny over his lobbying work for pro-Russia Ukraine figures.

The longtime political consultant was under house arrest for much of November and December of last year after a judge indicted him and one of his business associates, Rick Gates, on several felony charges in October, including conspiracy against the United States and acting as an unregistered foreign agent. Manafort pleaded not guilty to those charges.

They were the first criminal charges to come from Mueller’s investigation into Russian meddling in the 2016 election and possible ties to Trump’s campaign.

A judge released Manafort from house arrest last month but kept a nightly curfew in place. A trial was tentatively scheduled for May.

A spokesperson for Manafort told PBS NewsHour he had no additional comment beyond the court filing. The DOJ has not yet responded to NewsHour’s request for comment.