FILE - In this Nov. 5, 2014 file photo, then-U.S. Sen.-elect Thom Tillis, R-N.C., speaks in Charlotte, N.C. Nearly $5 million in advertising to help elect Tillis in last year’s midterm elections came from a group that does not have to disclose its donors. That’s according to tax filings made public on Tuesday by Crossroads GPS. That group was co-founded by Karl Rove, a strategist for former President George W. Bush. (AP Photo/Chuck Burton, File)

This is a breaking news update. This story will be updated.

Bob Corker reacts

"Thinking about my good friend @SenThomTillis this morning and praying for a quick recovery.

WASHINGTON (AP) — Republican Sen. Thom Tillis of North Carolina said Wednesday he's "fine" after collapsing during a Washington, D.C., race and being taken away by ambulance.

Tillis posted a video on Twitter from his hospital bed hours after the early morning race.

"Hey everybody, I'm fine. Just running about 2 and a half miles in and got overheated, no CPR, no special measures, just checking me out. See you back on the Hill," the first-term senator said.

Tillis, 56, was seen on the ground at about 15-20 minutes into the race, which started at 8 a.m. Bystanders were observed working on the senator in what appeared to be cardiac pulmonary resuscitation, but Tillis said there was no CPR administered.

Tillis at first appeared unconscious but was revived and breathing when taken away by ambulance. Tillis was participating in the ACLI Capital Challenge race, an annual event in Anacostia Park in the district. He was leading his own team, "Team Tillis."

Many politicians and other prominent Washington, D.C., figures run the annual race. Proceeds go to charity.

When not in Washington, Tillis lives north of Charlotte and is a former speaker of the North Carolina General Assembly. He was elected to the Senate in 2014.

Tillis is known for his athleticism as an avid mountain biker and participant in obstacle endurance races.

He is married to Susan Tillis and has two children.

Stay with the Times Free Press for more on this breaking news update.