At least seven times Barack Obama warned Assad that using chemical weapons would cross a red line.
There have been over a dozen chemical weapons attacks reported in Syria since 2012.
On Sunday dozens of people including children reportedly choked to death in a chemical attack near Douma, east of Damascus.
President Trump lashed out at Russia, Iran and Syria for the attack.
Then President Trump blasted former President Barack Obama for his fake red line with the Assad regime.
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