Mark Kelly, the husband of former Arizona congresswoman Gabrielle Giffords, called for political leaders to respond with "more than regret" to prevent future gun violence like the massacre in Newtown, Conn. on Friday. 

Kelly has advocated for for stricter gun control laws in the past. His wife and 18 others were shot at a town-hall meeting in Tucson, Ariz., in January 2011. Six people died.

Here's Kelly's Facebook post

I just woke up in my hotel room in Beijing, China to learn that another mass shooting has taken place - this time at the Sandy Hook Elementary School in CT. My thoughts and prayers are with the families of the victims and the entire community of Newtown, CT. I just spoke to Gabby, and she sends her prayers from Tucson.

As we mourn, we must sound a call for our leaders to stand up and do what is right. This time our response must consist of more than regret, sorrow, and condolence. The children of Sandy Hook Elementary School and all victims of gun violence deserve leaders who have the courage to participate in a meaningful discussion about our gun laws - and how they can be reformed and better enforced to prevent gun violence and death in America. This can no longer wait.

Here's how Kelly addressed Jared Lee Loughner, the Tucson shooter, at his sentencing in November.