Must read: U.K. Tory Rivals Fight to Stop Johnson From Winning Power

Key Developments:
Johnson promises to take part in debate on Tuesday but is unlikely to join leadership rivals in Sunday evening’s debate.
Health Secretary Matt Hancock withdraws, without saying who he will now support
Pressure is building on Johnson to take part in TV debates; Foreign Secretary Jeremy Hunt accused him of “hiding away”
Development Secretary Rory Stewart said he would serve in a Johnson government, despite the recent acrimony
Johnson Promises to Take Part in TV Debate (1 p.m.)
The front-runner said he will join a TV debate with his rivals once more of them have been knocked out of the contest next Tuesday. After stalling for the past week on whether he’d participate in debates with other contenders, Johnson said he is prepared to take part.

“It is important that we have sensible grown-up debates,” Johnson told BBC radio on Friday in his first broadcast interview of the campaign so far. “I’m more than happy to do the BBC TV debate on Tuesday.”

Johnson made clear he’s unlikely to participate in the first televised debate on Channel 4 on Sunday, saying debates with many candidates can be “cacophonous,” and that the best time to hold a debate is after the second round of voting on Tuesday – when at least one more candidate will be eliminated.

Hammond Warns Rivals on Taxes, EU Bill (11:40 a.m.)
Chancellor of the Exchequer Philip Hammond warned Conservative candidates seeking to succeed Theresa May not to undermine the party’s “hard-won reputation for fiscal responsibility,” and said the U.K. must pay the settlement bill agreed with the European Union.

“I would not recommend any of my colleagues threaten to withhold payments which are part of an existing obligation the U.K. has,’’ Hammond told reporters in Luxembourg, where he is attending a meeting of EU finance ministers. He also ruled out serving in any future government which pursued a policy of leaving the bloc without a deal.

Hammond, who wrote an open letter to all Tory candidates on Thursday urging them to be restrained in their spending plans, said a “couple of the candidates have signaled privately that they will be signing up to the pledge.”

Hancock Calls for ‘Scrutiny’ of Candidates (11:25 a.m.)
Health Secretary Matt Hancock called for remaining candidates in the contest to succeed Theresa May to be properly scrutinized. He declined to criticize the favorite, Boris Johnson, in an interview with the BBC broadcast shortly after he withdrew from the race, but made it clear he thought the former foreign secretary should sign up to televised debates.

“All the contestants should be in the TV debates; I think that there should be scrutiny,” Hancock said. “It isn’t just to be the leader of the Conservative Party, it’s to be the next prime minister — and so that scrutiny is important.”

Hancock said he’s talking to all the candidates to see how they can advance the pro-business, centrist agenda he’d been promoting. On his withdrawal, he said: “The party clearly is looking for a candidate to deal with the here and now. I very much put myself forward as a candidate focused on the future.”

Hancock Withdraws From Tory Race (11 a.m.)
Health Secretary Matt Hancock withdrew from the Tory contest to replace Prime Minister Theresa May, without saying who he would now support.

“I will look for the best way to advance the values we fought for, of free enterprise, and an open, aspirational, free society, underpinned by an optimistic belief in the value of each individual person,” Hancock said in an emailed statement. “I will talk to all the other candidates about how these values can be best taken forward.”

Hancock’s decision comes after he received 20 votes in the first-round ballot of Tory MPs on Thursday. Candidates need 33 votes to make it through the second round next week.

Hunt Says Johnson Is ‘Hiding Away’ (9:15 a.m.)
Foreign Secretary Jeremy Hunt, who came second in Thursday’s ballot, said Boris Johnson should take part in televised leadership debates to allow proper scrutiny. He referred to wartime leader Winston Churchill — about whom the front-runner has written a book — as he urged him to be more open.

“What would Churchill say if someone who wants to be prime minister of the United Kingdom is hiding away from the media?” Hunt asked in an interview on BBC Radio 4. “Anyone who wants that job should have the courage to put themselves forward, engage with the media and engage with the public.”

Hunt said he could negotiate a better “package’’ with the European Union and offer more choices than Johnson, who has committed to leaving the bloc by Oct. 31. Hunt said he would only agree to a no-deal divorce “in extremis.”

“His hard stop on October 31 is effectively saying the best we can offer the country is either a no-deal Brexit, or a general election if Parliament succeeds in stopping that no-deal Brexit,’’ Hunt said. “We need to ask is that the best for the country, are there some better choices?”

Umunna Said Mistake to Try to Build New Party (Earlier)
Chuka Umunna, the former Labour MP who announced late Thursday he had joined the Liberal Democrats after a short spell with Change UK, said his involvement in trying to form a new party had been a mistake.

“It’s quite clear there isn’t room for more than one center-ground option, particularly under first past the post, in British politics,’’ he told BBC Radio. “What people actually wanted us to do was to work together in the center ground with existing forces to build the strongest possible vehicle to take us forward.’’

Umunna, who described himself as “unapologetically internationalist,” said there is no way to both end austerity and “sponsor Brexit in the way the two main parties are doing.”