The assailant, prepared with "a lot of ammo," fought a gun battle with police before he, too, was shot and later died.
Coffman took questions for almost two hours on health care, the president's tax returns and the environment.
The decision by House Republicans not to bring their Obamacare overhaul bill up for a vote today is got mixed reaction from Colorado’s delegation.
Rep. Mike Coffman, a Republican, and Sen. Michael Bennet, a Democrat have introduced separate measures to help troops pushed out of the military without health benefits.
Sen. Cory Gardner voted in favor of President Trump's attorney general nominee Jeff Sessions. Sen. Michael Bennet opposed the nomination.
Members are under pressure from liberal groups to schedule constituent events, but only a few have put any on their calendars.
Read the full statements on Trump's executive order on immigration from Colorado's congressional delegation.
Mike Coffman, who represents Colorado's 6th Congressional District, talks about his promise to stand up to President-elect Trump and his hopes for the new administration.
If Rep. Mike Coffman survives this election, "it’s kind of hard to imagine him ever being really seriously challenged again" one Republican strategist said.
Coloradans are seeing far fewer presidential ads, lopsided U.S. Senate advertising and fewer outside groups getting involved.