He isn’t resigning. He has decided not to stand for reelection, thus not having to spend time campaigning, so he can concentrate, as Governor, on dealing with a complex fraud. His own statement:-
“Every minute I spend defending my own political interests would be a minute I can’t spend defending the people of
Minnesota against the criminals who prey on our generosity and the cynics who prey on our differences,” Walz said. “So I’ve decided to step out of the race and let others worry about the election while I focus on the work.”