The head of the Civil Service has been asked to investigate whether the Home Secretary's advisers "may have been briefing against" the head of the UK Border Force over the relaxation of checks.
Labour MP Simon Danczuk has written to the Cabinet Secretary, Sir Gus O'Donnell, asking him to investigate whether Theresa May's staff may have broken the code of conduct for special advisers.
The move followed a series of allegations about Brodie Clark's actions before he quit on Tuesday.
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