On the 29th anniversary of the Space Shuttle Challenger disaster, we remember the 7 crew members killed. We take a look back at Peter Jennings reporting on the explosion on January 28, 1986. | ABC World News Tonight with David Muir

"It is the worst disaster in the history of the American space program." ABC News coverage from this day in 1986, when seven astronauts died as the space shuttle Challenger exploded after liftoff from Cape Canaveral. https://abcn.ws/310q57b | ABC World News Tonight with David Muir

A group of pro-Trump attorneys and supporters have drafted an executive order aiming to give Pres. Trump sweeping unprecedented power over elections, multiple sources tell ABC News. Mary Bruce reports. https://abcnews.link/GzFWhX5 | ABC World News Tonight with David Muir

Lee Goldberg tracks the first major Arctic blast of the season that’s sweeping east, temperatures quickly plummeting on Monday and Tuesday. The South could see record-low temperatures, and wind chills in the Northeast could feel like 20s. https://abcnews.go.com/alerts/Weather | ABC World News Tonight with David Muir