He was facing mounting pressure to go, with 50 resignations from government.
Boris Johnson's standing down as British Prime Minister.
He'll make a statement later, but it's understood he'll remain in post until the Conservative Party's elected his successor over the summer.
It follows the resignation of 50 members of his government in two days, and the release of a letter from his new chancellor telling him to "go now".
The mass rebellion began when it was revealed Mr. Johnson knew about allegations of inappropriate behaviour against MP Chris Pincher - before he promoted him to deputy chief whip.
Mountmellick native Olivia Rowley is a former Labour councillor in Wakefield, Yorkshire.
She's been discussing the developing situation with Will Faulkner on Midlands Today:
Former British Justice Secretary, Robert Buckland - who was previously a loyal supporter of the PM - agrees it's time for change:
Cabinet Office minister Michael Ellis says Mr. Johnson will speak soon:
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