Former CIA Director John Brennan John Owen BrennanJournalism or partisanship? The media's mistakes of 2016 continue in 2020 Comey on Clinton tweet: 'I regret only being involved in the 2016 election' Ex-CIA Director Brennan questioned for 8 hours in Durham review of Russia probe MORE called for Congress to take action on gun laws following the deadly mass shooting at a South Florida high school this week.

“Having worked international counterterrorism for much of my career, it is imperative that we devote equal energy and effort to addressing the scourge of gun violence in our country,” Brennan tweeted late Thursday. “Congress needs to act now to prevent access to semiautomatic weapons that kill innocents.”

Having worked international counterterrorism for much of my career, it is imperative that we devote equal energy and effort to addressing the scourge of gun violence in our country. Congress needs to act now to prevent access to semiautomatic weapons that kill innocents. — John O. Brennan (@JohnBrennan) February 15, 2018

The U.S.'s assault weapons ban expired in 2004, a measure that blocked manufacturers from producing some semi-automatic weapons meant for civilian use.

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Brennan has emerged as an outspoken critic of the Trump administration, slamming President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE for attacking FBI leaders and calling him “a deeply flawed person” for referring to Haiti and African nations as “shithole countries.”

His tweet comes as Democrats step up their calls for Congress and Trump to take action on gun control following the shooting at Marjory Stoneman Douglas High School on Wednesday that left 17 people dead.

Trump said on Thursday that he would "tackle the difficult issue of mental health," but did not mention whether he would address gun laws.

Survivors of the shooting have also called for Congress to work on gun reform, and chants of “no more guns” broke out at a vigil for the shooting on Thursday.