Yet again, U.S. President Donald Trump’s Twitter feed has come back to haunt him, this time revealing a flip-flopping stance on how the Obama administration responded to the use of chemical weapons in Syria.

At least 58 people were killed Tuesday in northern Syria by a suspected government chemical attack against civilians, according to Britain-based Syrian Observatory for Human Rights. The attack, if confirmed, would mark the deadliest chemical attack in four years.

White House spokesperson Sean Spicer called the catastrophe “heinous” before pivoting to blame the previous administration’s “weakness” on Syria’s use of chemical weapons.