Former British prime minister Boris Johnson may soon head the British government once again just four months after resigning in July following a series of scandals, and he is one of the three most likely candidates to replace Liz Truss, who resigned as prime minister Thursday.Former British prime minister Boris Johnson has yet to formally throw his hat in the ring, but he joins former Finance Minister Rishi Sunak and Leader of the House of Commons and Lord President of the Council Penny Mordaunt as the most likely candidates.