FILE PHOTO - Former British Foreign Secretary Boris Johnson speaks in Parliament in London, Britain, March 12, 2019, in this screen grab taken from video. Reuters TV via REUTERS

LONDON (Reuters) - Boris Johnson, former British foreign minister and prominent eurosceptic, will now back Prime Minister Theresa May’s Brexit deal after she promised to quit if it passes, the deputy political editor of The Times said on Wednesday.

“Boris Johnson to switch sides and back the deal, source says. Promise of new leader to succeed May got him over the line,” Sam Coates said in a tweet.