CBS News reported Monday that a pro-life activist group’s years-long undercover investigation of Planned Parenthood’s is “now-discredited,” but congressional investigators don’t see it that way.

The Center for Medical Progress’ work on shedding light on Planned Parenthood’s controversial practice of salvaging organs from the remains of aborted children for donation has come under further scrutiny following a mass-shooting event in Colorado Spring, Colo., this weekend.