PM candidates set high bar for Brexit talks: no Irish backstop

The two candidates vying to be Britain's next prime minister set a high bar on Monday for success in Brexit negotiations, saying that even a significant concession from the European Union on the Irish border would be insufficient.Both frontrunner Boris Johnson and underdog Jeremy Hunt said on Monday that they would not be willing to accept the so-called Northern Irish backstop element of Theresa May's Brexit deal, even if a time limit was set.Britain's next leader will be announced next week, an