By Elizabeth Piper and Kate Holton
MANCHESTER, England (Reuters) - Apologizing for losing her Conservative Party's majority at a June election, Prime Minister Theresa May responded to her critics on Sunday by saying she had the right strategy to lead Britain and win a Brexit deal.
May, who has faced calls from within her party to step down, wants to use the Conservatives' annual conference in the northern English city of Manchester this week to try to reset her agenda, offering money to students and those people she once described as "just about managing" in Britain.
In an interview with BBC television, she played down the rifts among top ministers, saying they were united on their program and more importantly Brexit. That came a day after foreign minister Boris Johnson, perhaps May's biggest rival, set out four personal red lines in the complex talks with the EU.
"We've listened to the message that came from that election. But I've been very clear, I called the election, I led the campaign, I take my responsibility and I'm sorry that some very good members of parliament lost their seats," May said in an appeal to those party members still angry over the vote.
"What I have is a cabinet that is united in the mission of this government ... and agreed on the approach that we took in Florence," May said about a speech she made in Italy last month to try to kick-start Brexit talks that had all but stalled.
"Boris is absolutely behind the Florence speech and the line that we have taken."
Divisions in her cabinet have broken out into the open, with ministers using the media to air their differences on not only Brexit, but the government's approach to austerity - with many Conservatives concerned about the growing appeal for the main opposition Labour Party.
After ministers agreed to seek a transition period following Britain's departure from the EU in March 2019, Johnson said on the eve of the conference that this should last for two years at most; that Britain should not accept new EU or European Court of Justice rulings during transition; must not make payments for single market access when the transition ends; and should not agree to shadow EU regulations to gain access.
While not a clear departure from May's own stance, it increases pressure on her not give too much away in the talks to unravel more than 40 years of union with EU negotiators, who say they have yet to make enough progress to move to a discussion of the two sides' future relationship.
Following a bullish Labour conference last week, May hopes to fire up thousands of Conservative party members who feel let down by a disastrous election campaign, when their leader was dubbed "the Maybot" for her repetition of slogans.
May is now dependent on a small Northern Irish party for a majority to in parliament, and opinion polls indicate Labour is a growing threat, persuading rivals in the party not to try to topple her quite yet.
On her 61st birthday, she unveiled new policies to extend a program to help people buy their own homes and to freeze student tuition fees to try to win back younger people, who have flocked to Labour leader Jeremy Corbyn.
But despite pledging to spend billions more, May will also have to step carefully to avoid widening divisions in her party, with vocal pro-Brexit supporters fearful she might give too much ground in the EU talks.
In a message to them, she said the government was working on plans should it be impossible to agree a Brexit deal.
May's ally and effective deputy Damian Green said he was confident she could lead the Conservatives into the next election in 2022 and criticized those fuelling leadership speculation that hampers "a job not just for the party but more importantly for the government and the country".
But May has a long way to go to win over doubters.
"If you run any organization ... and something goes monumentally wrong, as did the election ... then the buck does have to stop with that individual," said Grant Shapps, former Conservative Party chairman.
"The reality is, every serious person knows, of course she can't lead us into the next election."
(Additional reporting by Guy Faulconbridge; Editing by Mark Potter)