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US President Donald Trump on Sunday put blame on former President Obama after the alleged chemical attack in Syria, The Hill reported.

"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.

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!

— Donald J. Trump (@realDonaldTrump) April 8, 2018

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.

Dozens died and hundreds were reported injured Saturday in an alleged chemical attack in Syria.

State Department spokesperson 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.”

The U.S. is calling on Russia to end its support for Assad.

Damascus has denied responsibility for the attack, Reuters reported.