ST. PAUL, Minn. (AP) — Minnesota Gov. Mark Dayton was taken to a hospital for testing after fainting during an event in the Twin Cities suburb of Woodbury Sunday.

Jaime Tincher, the governor's chief of staff, said in a statement Sunday evening that Dayton felt "increased pressure in his lower back" while speaking at the event, which was described as "very crowded and hot." He fainted and was taken to Regions Hospital "for further testing."

The statement says the 69-year-old would remain there overnight as a precaution. It says he is resting comfortably.

Dayton underwent elective lower back surgery in December. His office said at the time that the procedure was similar to one he had three years ago, which fused two vertebrae in his lower back. He also had had hip surgery in 2014.