“Even the best stories have a last chapter. This is it for me,” he said. “I’ve done the zillions of airline miles back and forth. I’ve signed over a million letters, cast more votes while in the chamber here and accomplished what I set out to do with more unfinished work still yet to come.”
Upton was on track to be forced into a Republican-on-Republican race due to state redistricting in Michigan.
This story is breaking and will be updated.