LONDON — The competition to replace Liz Truss as Britain’s prime minister intensified on Sunday, with Rishi Sunak pulling ahead in the scramble for votes of Conservative lawmakers, but Boris Johnson mounting a lively campaign to reclaim the job he gave up three months ago amid a cascade of scandals.
Mr. Sunak, who formally declared his candidacy with a promise to “fix our economy,” has lined up 136 votes, according to a tally midday Sunday by the BBC, more than double the 56 votes pledged to Mr. Johnson. A third candidate, Penny Mordaunt, has 23.
Beyond the numerical advantage, Mr. Sunak has picked up significant endorsements from people on the right flank of the Conservative Party. On Sunday morning, Steve Baker, a lawmaker who represents an influential group of euro-skeptics in Parliament, announced he would support Mr. Sunak.
“Boris Johnson would be a guaranteed disaster,” Mr. Baker told Sophy Ridge of Sky News. “We cannot allow it to happen.”
That is important because it suggests that not only do party leaders view Mr. Johnson as an intolerable risk, they also believe that Mr. Sunak, who served as chancellor of the Exchequer under Mr. Johnson, could bridge some of the bitter ideological fissures in the party, which were deepened by Ms. Truss’s turbulent six weeks in office. In the last contest, many figures on the party’s right flocked to Ms. Truss, which put her in a good position to beat Mr. Sunak.
Under the rules set out by the party, candidates are required to have nominations from at least 100 of the 357 Conservative lawmakers to advance to a second round of voting, among rank-and-file members of the party.
Candidates have until 2 p.m. Monday to gather nominations. On Monday, the party will hold two rounds of voting to winnow the field to one or two. If two remain, party members will cast online ballots later in the week.
If Mr. Johnson can drum up 100 nominations, it would significantly raise his odds of returning to Downing Street, as opinion polls suggest he would win the vote among members. Allies of the former prime minister insist he already has those 100 votes, but political analysts have expressed skepticism, noting that barely half that number have publicly declared their intention to back him.
Mr. Johnson did receive a notable endorsement from a member of his last cabinet, Nadhim Zahawi, who served briefly as chancellor of Exchequer after the resignation of Mr. Sunak. Mr. Sunak’s departure helped set in motion the wholesale walkout of ministers that finally toppled Mr. Johnson.
“When I was Chancellor, I saw a preview of what Boris 2.0 would look like,” Mr. Zahawi wrote on Twitter. “He was contrite & honest about his mistakes. He’d learned from those mistakes how he could run No10 & the country better.”
In July, Mr. Zahawi was among those urging Mr. Johnson to resign. “The country deserves a government that is not only stable, but which acts with integrity,” he wrote in a letter to his boss. “Prime Minister, you know in your heart what the right thing to do is, and go now.”
Mr. Johnson, who flew home on Saturday from a vacation in the Dominican Republic to begin lobbying lawmakers, has yet to formally declare his candidacy. But another of his former ministers, Jacob Rees-Mogg, told the BBC that he had spoken with Mr. Johnson, and that he would “clearly stand.”
Ms. Mordaunt, who officially threw her hat in the ring on Friday, is viewed as unlikely to advance past the first round of voting. But she insisted on Sunday that she, too, was confident of lining up more than 100 lawmakers.
British newspapers reported that Mr. Johnson was seeking to strike a deal with Mr. Sunak to join forces in a unity ticket, and that the two had met on Saturday. But the shape of such a ticket was unclear, given Mr. Sunak’s large lead among lawmakers, and the animosity between the two men makes any cooperation look far-fetched.
In the statement announcing his candidacy, Mr. Sunak said his experience as chancellor would equip him to lead Britain through the economic challenges that loom. He promised a government of “integrity, professionalism, and accountability,” drawing a clear comparison to the ethical failings of Mr. Johnson’s tenure.
The success of Mr. Sunak’s message will hinge on how lawmakers weigh that against their own electoral fortunes. The Conservatives are trailing the opposition Labour Party by more than 30 percentage points in polls. Though the Conservative Party’s steep erosion in support began under Mr. Johnson, he is still viewed by many as a proven vote-getter after his landslide victory in the 2019 general election.
Mr. Rees-Mogg, repeating the claim that Mr. Johnson had more than 100 votes, described him as the party’s “the greatest electoral asset,” contending that only he could engineer a victory over the Labour Party.
