WASHINGTON — As President Trump’s voter integrity commission looks under rocks for possible voter malfeasance, its members might want to examine a presidential nominee awaiting confirmation by the Senate Finance Committee.

Documents indicate that Jeffrey Gerrish, the president’s pick to be a deputy United States Trade Representative, moved from Virginia to Maryland last year, but opted in November to vote in the more competitive state of Virginia than his bright blue new home.

The Senate Finance Committee, which has been considering Mr. Gerrish’s nomination, was briefed on the matter on Tuesday, including the fact that Mr. Gerrish had almost certainly voted illegally, according to three Democratic congressional aides familiar with the briefing. Public records back up that notion.

Given Mr. Trump’s intense focus on alleged widespread voter fraud in last year’s election — the president has claimed that millions of people voted illegally, without evidence — Democrats are likely to pounce on the misstep to try to sink Mr. Gerrish’s nomination.