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Labour is calling for an investigation after the prime minister accused Sadiq Khan of leaving a “black hole” in Transport for London’s (TfL’s) funding during a Downing Street press briefing.

Boris Johnson accused the mayor of London of “blowing” TfL’s finances with an “irresponsible fares policy”.

Mr Khan dismissed the remarks as “lies”.

Labour has written to the Cabinet Secretary Simon Case to investigate if Mr Johnson broke the ministerial code.

The remarks were made from Downing Street during the pre-election purdah for the London mayoral election on 6 May.