PM advised to call in MI5 to investigate Huawei leak

Theresa May has 'no option' but to call in the security service MI5 to identify the source of a leak from the National Security Council, a founding member has said. Conservative MP Andrew Mitchell told Newsnight MI5 and the cabinet secretary Sir Mark Sedwill may have to interview cabinet ministers who sit on the council. The former international development secretary, who sat on the NSC between 2010-2012, spoke out following a leak from the council earlier this week.