Mr Johnson's activities at the conference will fuel speculation about his leadership ambitions, but Mr Lewis said his opposition to the Government's Brexit plan was not new and the Prime Minister's blueprint remained the only option on the table.
But she has since drawn criticism for overseeing major cuts to police budgets, a growing political issue amid rising crime and after a string of terror attacks.
On Johnson's prospects of becoming PM, Hammond mockingly said he doesn't "expect it to happen" because he can not do "grown-up politics".
But Johnson's recent comments about her Brexit plan, calling it "deranged" and saying it strapped a suicide vest to the British constitution, have angered many fellow MPs.
Johnson said simply that Britain should use a 20-month transition period after Brexit to negotiate a looser, Canada-style free trade deal while stepping up preparations for a "no-deal" exit.
However, Toyota became the latest high-profile business to warn that leaving the world's biggest trading bloc without any trading agreement could add costs and cripple output at plants which rely on the just-in-time delivery of tens of thousands of components.
She argues that her plan is the only way to avoid customs checks along the now invisible border between the U.K.'s Northern Ireland and European Union member Ireland - a development that would be troublesome for residents and businesses on both sides, and could undermine Northern Ireland's peace process.
Speaking on the fringe of the conference, the former foreign secretary - who quit Mrs May's Cabinet in July in protest at the Chequers plan - won an enthusiastic reaction on a scale not seen so far inside the main hall.
Johnson was a leading campaigner for Brexit in the referendum.
And she made clear she was not ready to hand over the reins of power, telling BBC Radio 4's Today: "I'm in this for the long term, not just for the Brexit deal but actually for the domestic agenda we are setting out at this conference".
A no-deal Brexit could harm the UK’s economy according to the IMF
After charming the crowds, there was a hunger from some of those present for Johnson to go further and declare a leadership bid - something his aides say he is reluctant to do, yet.
Since then, her party's pro- and anti-Brexit factions have taken turns to flex their muscles, seeking to influence her strategy and bringing her government to the brink.
This similarity was picked up by a cabinet minister who told The Sun that Johnson has been sounding more like Trump since he had a meeting with the U.S. president's ally Steve Bannon.
But he added: "I believe that when the Prime Minister lands this deal and brings it back, there will actually be a boost to the economy, as businesses start making those investments that they've deferred over the past year or so, consumers start spending on big-ticket items as they feel more confident knowing where we are going in the future".
She took to the airwaves again after Johnson's appearance, telling Sky News dismissively that he "always puts on a good show" while she focuses on things that mattered to people's "day-to-day lives".
Mary Wylie, a local party official from Devon in southwest England, said Johnson's speech expressed "my Conservative philosophy".
She retorted by arguing that his alternative proposals would result in a post-Brexit customs border between Northern Ireland and the rest of the UK.
"We Conservatives know that it is only a strong private sector economy that can pay for superb public services and that is the central symmetry of our one nation Toryism". "Northern Ireland is part of the United Kingdom".
He added: "I don't think this is a time to be talking about leadership challenges, it is a time to be supporting our Prime Minister as she takes forward this incredibly hard task of getting a deal with the European Union". And we have a guarantee for the people of Northern Ireland and we are upholding that.
You will need to be a 17-years or older resident of the USA , ideally with a 25 megabits per second connection to quality, though. The game will be free-of-charge to play for the duration of the Project Stream test, which will end in mid-January.
The self-proclaimed "God" is set to release album number nine very soon too, which will be named Yandhi . Instead, West invited the cast up to the stage as he ran down his final performance of the night.
She becomes the third woman to receive the #NobelPrize in Physics , joining Maria Goeppert-Mayer (1963) and Marie Curie (1903). Dr Ashkin developed a laser technique described as optical tweezers , which is used to study biological systems.
However, the new management structure at Arsenal means Emery has little say when it comes to contract negotiations. Asked if he thought the situation would impact on Ramsey's performances, Emery said: "I think not".
It marked the sharpest criticism by Trump of Ford since she came forward publicly with the allegation last month. The audience laughed as Trump, at times inaccurately, recounted what he described as holes in her testimony.
She was invited to join guests in a hot tub but she declined because she did not have a bathing suit, the complaint said. Ronaldo offered her clothing and then followed her into a bathroom where she was going to change clothes, it said.
The bureau has not yet interviewed Ford, Kavanaugh, or other witnesses identified by Ford's legal team as crucial to the probe. Here's something you might not expect to enter a conversation about Supreme Court nominee Brett Kavanaugh: The band UB40.
You won't get it if you aren't in range of a cell tower, for instance, or if your phone is switched off. During the Cold War, it was pretty common to see and hear tests of the Emergency Broadcasting System.
Kavanaugh has steadfastly denied all allegations against him, describing them as attacks by Democrats to derail his nomination. Smyth, two people who Ford said were at the gathering of teenagers where Kavanaugh allegedly assaulted her.
On many occasions I heard Brett slur his words and saw him staggering from alcohol consumption, not all of which was beer. But he has clear memories of the nominee's drinking during college and of the incident at the bar.
Dodgers' postseason hopes on the line in series vs. Giants
With the uncertainty of the playoff scenarios, the Dodgers aren't sure where they will go after Sunday's regular-season finale. The Brewers likewise got out to an early lead, getting two in the first inning before rolling to an 11-0 win over the Tigers.
Lawyer: FBI has completed Mark Judge interview
Anger: Democratic Congressional candidate Alexandria Ocasio-Cortez speaks at a rally against Brett Kavanaugh in Boston yesterday. Democrats on Monday expressed concern over Kavanaugh's statements about his activities and his alcohol consumption in school.
Amazon raises starting wage for its workers to $15 an hour
A public policy team employed by Amazon will begin pushing for an increase in the USA federal minimum wage of $7.25 per hour. Workers have been protesting against fast food chains like McDonald's Corp and demanding wage increases since 2012.
Cardi B turns herself in over Queens strip club fight
She was later released with a "desk appearance ticket" to return to face the charges at a later, as-yet-unspecified court date. TMZ reports that Cardi will be charged with allegedly ordering an attack on two bartenders at a strip club in Queens, NY.
Wozniacki, Kerber crash out at Wuhan Open
Aryna Sabalenka will perform in the semi-final of the prestigious tennis tournament of Premier category in Chinese Wuhan . Puig also came from behind in the second set, rallying from 3-1 down to get the job done in two hours and 24 minutes.