Asked about her likely successors hardline stance, she said whoever takes over the top job should focus on getting a deal through Parliament.
Mr Johnson has pledged to take Britain out of the EU by October 31, implying hell use any means necessary.
He has refused to rule out ignoring MPs and proroguing Parliament to ram through a no deal Brexit, even if he doesnt have enough support.
Asked about this as she arrived for her final European Council summit, Mrs May said the next prime minister should focus on getting a deal through Parliament.
She said: Ive always been very clear that I think the best approach for the UK is to first of all ensure were delivering on the vote that took place in 2016, leaving the EU, but that we do that with a good deal so we can do it in an orderly way.
I still think we negotiated a good deal, I wasnt able to get a majority in Parliament for that deal.
It will be up to my successor to get that majority, deliver on the vote and take us forward.
Jeremy Hunt, the rival candidate to take over as prime minister, has refused to commit to a deadline unlike Mr Johnson.
He said the fastest way to leave the EU was by getting a new withdrawal deal, and that guaranteeing a specific date to leave the union was a fake debate.
Despite that, he said he would back a no deal Brexit but only with a heavy heart if renegotiation failed.
— Jeremy Hunt (@Jeremy_Hunt) June 30, 2019
As a nation we are more divided than we have ever been. But with your support, we will leave the EU on October 31st, with or without a deal, so we can begin to unite our country, restore trust in politics, and move beyond Brexit to create a brighter future for Britain pic.twitter.com/bjUgOnYYq2
— Boris Johnson (@BorisJohnson) June 29, 2019
Walking the red carpet into a Brussels summit for what is expected to be her final time, Mrs May said she was proud of what she had achieved, particularly around security threats and environmental issues.
She said: Of course we have had sRead More – Source