The former London mayor seeks some payback with endorsement in the three-way contest.
Source: Race for British prime minister intensifies as one-time Brexit allies turn rivals – The Washington Post
Not only did Brexit cause social tensions to escalate in the U.K. as well as a shock to domestic and foreign financial markets, it also resulted in the resignation of the current Prime Minister David Cameron. Whoever his successor will be, they will have to handle the upcoming negotiations with the EU while attempting to unite a divided Britain at the same time; not an easy job.