(FILES) In this file photo taken on May 28, 2019 Conservative MP Boris Johnson leaves his residence in south London. Boris Johnson, the front-runner to become Britain's next prime minister, must attend court over allegations that he knowingly lied during the Brexit referendum, a judge announced Wednesday, May 29. / AFP / Daniel LEAL-OLIVAS
British politician Boris Johnson leaves his home in south London AFP 

British PM candidate Boris Johnson ordered to attend court over Brexit 'lies'