Despite three cabinet ministers backing Mr Johnson, the former prime minister remains a divisive figure - and some Tory MPs have threatened to withdraw the party whip if he returns.
After ruling himself out of the race, Mr Wallace said he is"leaning towards Boris Johnson".
Mr Johnson remains a divisive figure, however, and some Conservative MPs have threatened to withdraw the party whip if he returns. Sir Roger Gale, the senior backbencher, reminded voters in a tweet that the former prime minister remains under investigation by the Commons privileges committeeSir Roger told Times Radio that, if Mr Johnson is voted back in as prime minister, he would give up the whip and stand as an independent.
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