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He opted for a Russian-backed proposal that was supposed to remove and eliminate Syria’s chemical weapons stockpiles.

“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 from the White House.

Questions about the administration’s possible response reverberated throughout Washington in the hours after the attack.

“It’s a defining moment in his presidency” that comes as Assad sees the U.S. “determination to stay in Syria waning,” said Sen. Lindsey Graham, R-S.C.,

“If he doesn’t follow through and live up to that tweet, he’s going to look weak in the eyes of Russia and Iran,” Graham said. “You need to follow through with that tweet. Show a resolve that Obama never did to get this right.”

Graham and Bossert were on ABC’s “This Week,” and Collins appeared on CNN’s “State of the Union.”