"Barack Obama made a vow to the American public: If Syria’s Bashar al Assad used chemical weapons on his own people, America would get involved. He drew, in his own words, a red line.  Following that vow, there was a chemical attack on Syrians by Assad’s regime. Obama’s response? Nothing.

"In recent days, Assad’s regime unleashed a horrifying chemical attack on his own citizens. The images have haunted social media in recent days, and President Donald Trump said it was absolutely unacceptable.

"Assad crossed Obama’s red line (yet again), but Trump was having none of it."