Holborn and St Pancras MP Sir Keir Starmer says he's "seriously considering" a run to succeed Jeremy Corbyn as Labour Party leader.
The shadow secretary Brexit secretary is urging his party to return to being a "broad church", without ditching its radical policy platform.
The remain-backing former director of public prosecutions has been widely tipped to throw his hat into the ring to lead the party after its worst General Election result since 1935.
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He announced his leadership ambitions in an interview with the Guardian.
Sir Keir said: "It is a devastating [election] result, but it's important not to oversteer.
"I want trust to be restored in the Labour party as a progressive force for good: and that means we have to win. But there's no victory without values."
He also called for an end to factionalism in the party, adding: "I don't think anybody would call me a Corbynista, but I'm a socialist."