A professor who challenged the 2013 claims of a chemical attack in Syria is now questioning the Trump administration’s narrative blaming the Assad government for the April 4 attack in the Idlib province town of Khan Shaykhun. On Tuesday, the White House released a declassified intelligence brief accusing Syrian President Bashar Assad of ordering and organizing the attack, in which Syrian planes allegedly dropped chemical ordnance on civilians in the rebel-held town. The report “contains absolutely no evidence that this attack was the result of a munition being dropped from an aircraft,” wrote Massachusetts Institute of Technology (MIT) Professor Theodore...