Several Connecticut families were at the White House on Monday as President Joe Biden announced new regulations to crack down on gun violence.

Mark Barden and Nicole Hockley, who both lost children in the Sandy Hook Elementary School shooting, were in attendance, along with the parents of Ethan Song.

Biden announced new Department of Justice regulations designed to stop the spread of so-called "ghost guns" – guns which are privately made without serial numbers. They are increasingly cropping up in violent crimes.

The new rules require anyone purchasing a firearm kit to undergo a background check.

It also requires those selling the kits to mark components with a serial number.

On Twitter, Ethan Song's father Mike Song posted a photo writing, "In the Rose Garden for Ethan."

Ethan Song was killed by an unsecured gun. Ethan's Law is for the safe gun storage with kids in the home.

Hockley tweeted she was proud to represent Sandy Hook.

Gov. Ned Lamont Monday applauded Biden's announcement, citing its similarities with Connecticut's 2019 law.

Biden also announced Monday the nomination of Steve Dettlebach, who served as a U.S. attorney in Ohio from 2009 to 2016, to run the Bureau of Alcohol, Tobacco, Firearms and Explosives.