The ex-chancellor lost out to Liz Truss in the last leadership contest just six weeks ago after warning her tax plans would bring turmoil.
Boris Johnson
Rishi Sunak promises ‘integrity and professionalism’ as he enters Tory race
The former chancellor became the second candidate to declare their prime ministerial ambitions.
Rishi Sunak ‘wins enough support to progress in Tory leadership campaign’
The former chancellor is the first candidate to be the next prime minister believed to have reached the 100-nomination threshold.
‘Up for it’ Boris Johnson flying back from Caribbean to run for prime minister
Having resigned in disgrace just six weeks ago, Mr Johnson was attempting an extraordinary comeback.
Rishi Sunak ‘first contender to pass threshold of 100 Tory MPs’
Former PM Boris Johnson was lagging behind, as was Commons Leader Penny Mordaunt.
SNP preparing for general election as Boris Johnson returns to UK
The former prime minister has flown back to the UK, with many in his party tipping him to return to power after Liz Truss dramatically quit.
Boris Johnson jets back to UK as Tories split on his expected leadership bid
The former prime minister cut short a family holiday in the Dominican Republic as the race to replace Liz Truss gathered momentum.
Who is backing who in the Tory leadership race?
Candidates need the support of 100 MPs to get on to the ballot on Monday.
Johnson would be ‘distracted’ by partygate probe if he became PM again – Raab
Dominic Raab, who was deputy PM in Boris Johnson’s government, thinks he would soon be ‘absorbed’ by the Privileges Committee investigation
Backing Boris Johnson for prime minister again is ‘retrograde’, Greg Hands says
In July, Mr Johnson had offered him the Northern Ireland secretary job.