(Alliance News) - Boris Johnson said he is planning to be UK prime minister into the 2030s despite Conservative critics plotting to oust him after voters rejected the Tories in a double by-election defeat.
Johnson insisted he was "thinking actively" about fighting the next two general elections to become the longest-serving post-war leader.
He urged Tory members of Parliament plotting to oust him not to focus on the issues he has "stuffed up" after his authority was further diminished by a Cabinet resignation.
And he insisted questions over his leadership were now settled after the loss of Wakefield and former stronghold Tiverton and Honiton.
But the attacks kept on coming from his own backbenches on Saturday night, with Damian Green, who chairs the One Nation caucus of Tory MPs, warning the government "needs to alter both its style and content" and calling on Cabinet members with leadership hopes to show their stripes.
Former minister David Davis also lashed out at the PM's claim the only argument of "substance" for a change of direction he had heard from his critics was for the UK to return to the EU single market, arguing this is "plainly not true of me, or many others".
Johnson earlier insisted the "endless churn" of allegations was "driving people nuts", as he pushed on with his Rwanda trip despite suggestions further ministerial resignations could follow.
Oliver Dowden resigned as Tory party co-chair, saying he and Conservative supporters were "distressed and disappointed by recent events" and telling the prime minister that "someone must take responsibility".
But Johnson set his sights on being in office in the "mid 2030s", in a run that would see him outlast Margaret Thatcher's reign.
Asked by journalists at the British high commissioner's residence in Kigali if he would lead his party into the next election, he said: "Will I win? Yes."
In a buoyant mood, the prime minister added: "At the moment I'm actively thinking about the third term and what could happen then, but I will review that when I get to it."
Labour, meanwhile, challenged the Tories to call an early election, with leader Keir Starmer telling Johnson: "Bring it on."
Further controversy loomed on Saturday evening as The Telegraph reported the PM intends to impose sweeping new steel tariffs in a drive to win back support in traditional Labour heartlands.
The newspaper said the changes were the same as those cited by Lord Geidt when he resigned as Johnson's ethics chief, as he claimed he had been forced into an "impossible and odious" position by the prime minister.
Former Conservative leader Michael Howard has urged Johnson to step down for the good of the party and the nation, and called on the Cabinet to consider resigning to force him out.
But the PM said in Rwanda: "I love my colleagues and of course I would urge them respectfully: golden rule of politics, the more we focus on Westminster politics the more irritating it is to voters."
He argued that "what's driving people nuts is this endless churn of stuff about things that I'm meant to have stuffed up or whatever about my colleagues, their views of me, my character, the leadership, Tory blah blah…"
There are suggestions of a challenge to change the rules of the 1922 Committee of Conservative MPs in order to allow another vote of confidence in Johnson within the next year.
Asked if he believes questions over his leadership are settled, Johnson replied: "Yes."
Conservative veteran Geoffrey Clifton-Brown, who retained his Cotswolds seat with a majority of 20,000 at the last vote, is among the Tories to have expressed fears they could lose their jobs at the next general election.
In the by-election in the Devonshire constituency of Tiverton and Honiton, a dramatic swing of almost 30% from the Conservatives saw their 24,000 majority overturned by the Liberal Democrats.
In West Yorkshire, Labour seized back Wakefield with a majority of 4,925 on a swing of 12.7% from the Tories.
By Sam Blewett, in Kigali, and Amy Gibbons, PA Political Staff
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