Mr. Malinowski, a former House member running for Ms. Sherrill’s seat, was being criticized for his vote in favor of legislation that had authorized funding for federal immigration enforcement and passed with broad bipartisan support. In the ad, a woman’s voice warns ominously that the vote funded “Trump’s deportation force,” suggesting that Mr. Malinowski, who emigrated from Communist Poland as a child and strongly opposes the president’s immigration policies, can’t be trusted.