U.S. Representative Elissa Slotkin, a third-term lawmaker with extensive national security experience, won election to the U.S. Senate in Michigan, Edison Research projected on Wednesday, a boost for Democrats trying to hold their majority in the chamber.

DETROIT — Democratic U.S. Rep. Elissa Slotkin has won Michigan’s open U.S. Senate seat, giving Democrats a bittersweet victory in a swing state that also backed Republican President-elect Donald Trump in his successful bid to return to the White House.