LONDON, June 28, 2016 (Xinhua) -- Leading Brexit campaigner Boris Johnson leaves his home in London, Britain on June 28, 2016. Boris Johnson tried on Sunday to drive home future efforts to intensify cooperation with Europe in a bid to allay doubts among the divided British public. Boris Johnson is thought to be the frontrunner to succeed Prime Minister David Cameron after the latter announced to resign following the European Union referendum result to leave. (Xinhua)
