Any remaining ballots must be delivered by the Monday 5:00pm (1600 GMT) deadline.
The British Parliament has voted against a no-deal Brexit, which gives the next prime minister limited room to manoeuvre.
Johnson has vowed to take Britain out of the European Union on October 31, with or without a divorce deal. Justice Secretary David Gauke has done likewise and others intend to quit their posts on Wednesday, immediately after Mrs May's final appearance at PMQs, because they're so appalled by Mr Johnson's threat of a no-deal Brexit and don't wish to afford him the satisfaction of sacking them.
Either he or Jeremy Hunt will be named as Theresa May's replacement as prime minister next week.
Here's a look at the challenges Jeremy Hunt or Boris Johnson will face when they step foot inside Number 10.
The "No to Boris, yes to Europe" protest saw a giant balloon of Johnson - inspired by the similar blimp of US President Donald Trump - flying outside parliament.
"I want to be on the right side of history", demonstrator Tamara Bishop told AFP.
It is said they could even consider joining the Lib Dems - depriving Mr Johnson of a majority even with the backing of the DUP. "Which might be completely the opposite to what he's promised".
British Airways suspends all flights to Egypt’s capital Cairo
On Saturday, July 20, 2019, British Airways said it is canceling flights to Cairo for a week for unspecified security reasons. Earlier, another major airline British Airways announced that it suspended Cairo flights for a week over security concerns.
"We would travel up to Northern Ireland and go through a military checkpoint where you had guns pointed at you", Benson said, referring to the 30-year conflict in Northern Ireland known as the Troubles, which formally ended with the Good Friday Agreement in 1998.
Mr Trump's U.S. has adopted a tough public approach to China - banning Huawei and slapping tariffs on steel and other imports - while the United Kingdom has sought to build a "golden era" of relations with Beijing.
Mr Johnson has also faced repeated questions about his blunder as foreign secretary in the case of jailed British-Iranian Nazanin Zaghari-Ratcliffe, who he mistakenly said had been training journalists - comments which were seized on by the authorities in Tehran. "I like Boris Johnson, I always have", he told reporters in the Oval Office in Washington DC.
Despite the reservations some Tory members have, Mr Johnson remains a darling of the Conservative faithful, as shown during his appearances at party conferences where activists will queue for a chance to hear him speak. The sovereign will then invite the new Conservative leader to form an administration.
The poll also found the Brexit Party surge was fading in the wake of its European election success in May, with support dropping four points to 14 per cent if a general election was held today. She will remain in parliament as the MP for her Maidenhead constituency in southern England.
Keir Starmer, Brexit policy chief in the main opposition Labour Party, said on Twitter he respected Hammond's decision.
"That is what is likely to happen, and I'm making my plans accordingly", he said, adding he would wait until the result is announced on Tuesday to "see for sure".