london britain foreign minister boris johnson accuse cabinet colleagues sunday backseat drive brexit set vision country future outside european union days prime minister theresa may due speak italy britain plan eu departure johnson saturday publish 4,300-word newspaper article roam well beyond ministerial brief case approach set government interior minister amber rudd say absolutely fine foreign secretary intervene publicly want manage brexit process get theresa may manage process drive car rudd tell bbc andrew marr sunday ask johnson backseat drive reply yes could call backseat drive absolutely johnson article re-ignited speculation would challenge may leadership conservative party rudd however say think johnson lay groundwork challenge may think like support prime minister difficult time try conclude negotiations eu say may deputy damian green also weigh say johnson write exuberant article absolutely clear everyone driver car instance prime minister job rest us cabinet agree set proposals get behind proposals get behind prime minister green tell bbc tv johnson write daily telegraph britain would pay access eu market future eu country borrow invest infrastructure reform tax code set immigration level see fit say johnson also repeat brexit campaign claim government would 350 million pound 476 million week good outside eu government officials criticize johnson repeat claim say figure take account fund britain receive back brussels david norgrove uk statistics authority say surprise disappoint johnson still quote figure confuse gross net contributions clear misuse official statistics norgrove say letter johnson sunday johnson say reply norgrove letter base appear wilful distortion text article ask official withdraw time johnson article publish day bomb injure 30 people train london also draw criticism colleagues react furor article generate johnson tweet saturday look forward pm florence speech behind theresa glorious brexit britain 's boris johnson accuse brexit 'backseat drive