A Michigan Democratic senate candidate has seized on the delayed opening of the Gordie Howe International bridge, turning the controversy into a political liability for U.S. President Donald Trump in a closely watched senate race.

Mallory McMorrow, running in a three-person Democrat primary race, released an advertisement on Wednesday accusing Trump of refusing to open the completed bridge because the Moroun family, which owns the competing Ambassador Bridge, donated $1 million (U.S.) to MAGA Inc.