In this April 7, 2017, file photo, Sen. Thom Tillis, R-N.C., speaks to reporters on Capitol Hill in Washington. Tillis collapsed Wednesday during a race in Washington but later announced that he was fine. Susan Walsh AP
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Jeff Darman, director of the ACLI Capital Challenge said later that Tillis was responsive and taken to George Washington University Hospital. Darman said he didn’t know of the senator’s condition after being taken away by the paramedics.

“He just had a seizure, is what the medical people told me, but when he went down, he did not bang his head,” Darman said. “He was talking ... and in good shape, they said. They just took precaution and sent him to the hospital.”

The annual three-mile race attracts a slew of lawmakers every year.

Sens. Tom Cotton, R-Ark., Tammy Duckworth, D-Ill., Jack Reed, D-R.I., Shelley Moore Capito, R-W.Va., and John Cornyn, R-Texas all served as team captains for the race according to Roll Call, along with Reps. Rodney Davis, R-Ill., Susan A. Davis, D-Calif., Tom Reed, R-N.Y., Vicky Hartzler, R-Mo., Tom Graves, R-Ga., Kyrsten Sinema, D-Ariz., Earl Blumenauer, D-Ore., Tim Walz, D-Minn., Kathleen Rice, D-N.Y., Jim Cooper, D-Tenn., and Daniel Lipinski, D-Ill.

The ACLI Capital Challenge raises money for the Fidelco Guide Dog Foundation, which pairs guide dogs with people who have disabilities.

Tillis won election to the Senate in 2014 after serving as speaker of the North Carolina House of Representatives from 2011 to 2015. He is up for reelection in 2020.

William Douglas contributed to this report.

Alex Daugherty: 202-383-6049, @alextdaugherty