Texas school shooting: What’s changed in U.S. gun control since Sandy Hook?

“What are we doing?” Democratic Sen. Chris Murphy asked the U.S. Senate multiple times Tuesday following the latest mass shooting in the U.S., which killed 21 in a Texas elementary school. He asked his colleagues why they bothered running for the Senate if they plan to stand by and do nothing on gun violence in the country.

“We have another Sandy Hook on our hands,” he said.