Mark Kelly, Husband of Wounded ex-U.S. Rep. Gifford's to Run for U.S. Senate

Kelly will challenge Republican U.S. Senator Martha McSally, a former U.S. Air Force combat pilot who was appointed to the seat held by the late John McCain

In this Nov. 12, 2018, file photo politician and gun control advocate Gabrielle Giffords and husband, retired astronaut Mark Kelly, attend the Glamour Women of the Year Awards at Spring Studios in New York. Kelly said Tuesday, Feb. 12, 2019
Photo by Evan Agostini/Invision/AP, File

Retired U.S. astronaut Mark Kelly, whose wife former Congresswoman Gabby Giffords was wounded in a 2011 mass shooting, plans to run for a U.S. Senate seat in Arizona, he said in a video posted to Twitter on Tuesday.

Giffords stepped down from Congress after sustaining a serious head injury in the attack but has emerged as one of the leading voices of the U.S. gun-control movement.

In the 4-1/2 minute video, Kelly sits on a sofa next to Giffords, discussing his mother's history as a police officer as well as the attack on his wife.

"I thought that I had the risky job. It turned out that you were the one who had the risky job," said Kelly, a former U.S. Navy combat pilot and former space shuttle commander.

Kelly will challenge Republican U.S. Senator Martha McSally, a former U.S. Air Force combat pilot who was appointed to the seat held by the late John McCain. A special election will be held in 2020 to determine who will serve the last two years of the term.

McSally lost a campaign for the state's other Senate seat to Democrat Kyrsten Sinema in November.