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Intelligence expert Bob Ayres argued the so-called "extreme" vetting procedures were being put in place to lower the risk of an attack on the US.

The officer also denied claims from Boris Johnson that an exception had been secured for British citizens travelling to the US.

Speaking on LBC he said: “Is it going to work? Yes, it’s going to work.

“It will curtail inward immigration from what are perceived to be high-threat countries until such a time the United States can develop what they are going to use for their extreme vetting processes.