Minn., confronted Republican Sen. Mike Lee of Utah on Capitol Hill Monday after he posted unfounded claims on social media that the alleged gunman who shot two legislators and their spouses is a liberal and may have been associated with Gov.

The Democratic senator from Minnesota and others implored the Utah Republican to take down his "cruel" social media posts and apologize to the victims' families.

Learn more about the Republican lawmaker from Utah under fire for his response to the assassination of Democratic lawmakers on social media.