Investigators still trying to determine if Tehran behind attacks on Saudi oil; Lawmaker urges president to go to Congress as strikes could lead to 'a medium to large-scale war'
World powers divided over how to handle 'alarming' humanitarian crisis in Idlib, with some 400,000 people having fled their homes in last rebel-held province
Senior intelligence official appears before congress to discuss 'urgent' concerns about president's communications with unnamed counterpart; Trump blasts report as 'fake news'
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