Congressman Dean Phillips launches moon shot primary challenge to Biden

Mr Phillips has served in the House of Representatives since 2019 and represents a mostly suburban district that includes parts of Minneapolis' outskirts.

In an interview with CBS, the BBC's US partner, Mr Phillips said that while he believes Mr Biden has done a "spectacular job", he is worried about his ability to win a nationwide general election against his likely competitor, former president Donald Trump.

"This is an election about the future," he said. "I will not sit still and not be quiet in the face of numbers that are so clearly saying that we're going to be facing an emergency next November".

A Gallup poll released this week showed that Mr Biden's job approval rating among Democrats fell 11% in the last month, to 75% - the worst of his presidency among Democrats. Overall, his approval rating stands at 37%, with only 5% of Republicans approving of his performance.

In New Hampshire, Mr Biden also drew the ire of some Democrats by diluting the state's influence in the 2024 primary calendar, which state party chairman Ray Buckley warned in a letter could lead to an "embarrassment" from "an insurgent candidate, serious or not".

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