The 47-year-old senior cabinet minister was widely expected to become the third female British Prime Minister after 170,000 online and postal votes cast by Tory members, ending Sunak's historic run as the first member of Parliament of Indian heritage to compete for the top job at 10 Downing Street.
Britain's Prime Minister-elect Liz Truss will spend Monday putting finishing touches to her new cabinet after being elected Conservative Party leader and is expected to unleash a complete shake up of outgoing leader Boris Johnson's top team.
Newly-elected Conservative Party leader and prime minister in waiting Liz Truss is among the senior British politicians known for championing deeper India-UK strategic and economic ties, describing them as a "sweet spot" of global trade dynamics.
If elected, 42-year-old Sunak will go on to make history as the first Prime Minister of the UK of Indian heritage.
The race to replace Boris Johnson as the Conservative Party leader and the British prime minister entered the final countdown stage on Friday, when voting officially closes for Tory members to choose between former chancellor Rishi Sunak or Foreign Secretary Liz Truss.
The Cabinet minister pulled out of the interview hours before it was to air on Tuesday evening, with her team saying she could no longer spare the time.
The United Kingdom's biggest aircraft carrier, HMS Prince of Wales, has broken down off the south coast of England after setting sail from Portsmouth Naval Base for the United States on what the Royal Navy has described as a 'landmark' aviation trial mission.
Britain's prime ministerial candidate Rishi Sunak has said he wants to change the UK-India relationship to make it a more two-way exchange that opens up easy access to UK students and companies in India.
The video shows the 42-year-old British Indian former minister interacting with voters and is also seen catching a quick power nap on a bench as a voiceover praises his efforts to "fight for every inch".
The survey also shows a majority in favour of ousted leader Boris Johnson, with 55 per cent saying that Tory MPs were wrong to effectively force him to resign and 40 per cent saying they were right.
Rishi Sunak has revealed that his former boss, Boris Johnson, has not returned any of his messages and calls since he resigned from his cabinet as chancellor, implying tension between the duo as the British Indian former minister battles it out in a tough race to be elected the next leader of the UK's governing Conservative Party.
Former chancellor Rishi Sunak convincingly won over an audience of Conservative Party members in a head-to-head television debate with rival Foreign Secretary Liz Truss in the leadership contest to elect a new Tory party leader and British prime minister.
A new survey of Conservative Party members, who will be casting their ballots to pick the new Tory leader to succeed Boris Johnson as British Prime Minister, on Wednesday shows a widening lead for Foreign Secretary Liz Truss over Rishi Sunak in the leadership contest.
The postal ballot papers were to be mailed out from Monday but are now expected to start being issued a few days later, with a delivery deadline set as next Thursday.
Former UK chancellor Rishi Sunak is closing the gap to catch up with rival, Foreign Secretary Liz Truss, in the race to 10 Downing Street, with only five points separating the two in a latest poll of the Conservative Party members on Tuesday.
As the voting process for the new Conservative Party leader formally opened with postal ballots being mailed out to Tory members from Monday, Rishi Sunak vowed to cut the basic rate of income tax by 20 per cent in a few years if he is elected Britain's prime minister.
According to The Sunday Times, Prince Charles met with the Al Qaeda founder's half-brother Bakr in London and allegedly agreed to accept GBP 1 million.
The 42-year-old British Indian politician acknowledges "playing catch-up" to Liz Truss in the race as he continues his campaign tour of the UK to win over Conservative Party members' votes.
Rishi Sunak and Liz Truss, the two finalists in the race to succeed Boris Johnson as the Conservative Party leader and British prime minister, were grilled on their policies in the first hustings directly addressing Tory party members who will be voting in the election.
Rishi Sunak rushed to the side of a television host after she fainted live on air during a UK prime ministerial election debate, which was cancelled mid-way through.