A jury found Hadi Matar, 27, guilty after a little less than two hours of deliberations following a trial in Chautauqua County Court, New York.
Sir Keir has faced pressure to take a firm line with Mr Trump on support for Ukraine when he visits the US next week.
Stand-still delays have been reported along the A55 near J39 posthouse roundabout in the direction of Wrexham.
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