Nearly a decade after getting caught in the dragnet of Washington’s largest lobbying scandal, a former congressional staffer is still battling his corruption conviction in federal court.

Lawyers for Fraser Verrusio, a former policy director on the U.S. House Transportation Committee, are set to appear Wednesday before a three-judge panel on the U.S. Court of Appeals for the D.C. Circuit Wednesday as part of a legal crusade to overturn his conviction. They’ve pinned their hopes on the U.S. Supreme Court’s 2016 McDonnell v. United States ruling, which overturned the conviction of former Virginia Gov. Robert McDonnell and cast a long shadow in public corruption prosecutions.