Former Capitol Police officer Harry Dunn, who took on Jan. 6 rioters, discusses congressional run

Three years ago, Harry Dunn squared off with the mob of supporters for former President Donald Trump that attacked the U.S. Capitol on Jan. 6 and risked his life to defend the building.

The former Capitol Police officer has been outspoken about the dangers he, his fellow officers and members of Congress faced that day and, more importantly, what he says are the ongoing threats to democracy.

Earlier this month, Dunn announced he is running on the Democratic ticket for Maryland's 3rd Congressional District after the incumbent, Rep. John Sarbanes (D), announced he's not seeking reelection.

Dunn spoke with ABC News Live's Linsey Davis on Monday about his platform.

ABC NEWS LIVE: We know that you're running as a Democrat to represent Maryland's 3rd Congressional district, which includes several counties outside of Baltimore. First and foremost, just share with us why you decided that you wanted to run.

HARRY DUNN: Thanks for having me on. It's always good to talk with you. It's been three years now since the Jan. 6 attack on this nation. I've been working as hard as I can to seek out accountability and fight for justice and the preservation of our democracy and our Constitution. I've been doing that in a public capacity for the last three years, and I feel like I've done all that I can do in the role that I've been in as a Capitol Police officer in the furtherance of that fight. I love the saying that until there's nothing that can be done, there's always something that can be done.

And it's no exaggeration to say that we are still under a threat of our democracy no longer existing. And once Mr. Sarbanes, who represents the 3rd District now, announced that he is not seeking election, that created a real opportunity for me to do