Rep. Ted Lieu (D-Calif.) tore into President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE on Sunday after he put blame on former President Obama following reports of a chemical attack in Syria.

"Dear @realDonaldTrump: Remember when you launched cruise missiles at a largely empty field in Syria? That unconstitutional act didn't do very much," Lieu tweeted. "Remember when you said last week that US is leaving Syria in six months? So what is your plan? You're the President now. Remember?"

Dear @realDonaldTrump: Remember when you launched cruise missiles at a largely empty field in Syria? That unconstitutional act didn't do very much. Remember when you said last week that US is leaving Syria in six months?



So what is your plan? You're the President now. Remember? https://t.co/Va3ls7QI4m — Ted Lieu (@tedlieu) April 8, 2018

The comments come after dozens of people reportedly died and hundreds were reported injured Saturday in an alleged chemical attack in Syria.

State Department spokeswoman Heather Nauert said in a statement that U.S. officials are closely following the “disturbing reports … regarding another alleged chemical weapons attack, this time targeting a hospital in Douma, Syria.”

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Trump took to Twitter Sunday to condemn the attacks and rail against Obama.

"If President Obama had crossed his stated Red Line In The Sand, the Syrian disaster would have ended long ago! Animal Assad would have been history!" Trump tweeted, referring to Syrian President Bashar Assad.

Obama said last year that he believed his decision to negotiate rather than respond with force to Syria’s use of chemical weapons required some of the greatest “political courage” of his presidency.

That was despite Obama saying in 2012 that if Assad used chemical weapons it would cross “a red line” with the U.S. The United Nations accused Syria of using chemical weapons on its own people in 2013.