US President Donald Trump faces “the beginning of the end,” Vermont Senator Bernie Sanders declared today after storming to victory in the New Hampshire Democratic Party caucus.

“Tonight, New Hampshire sent a message that working people are ready for a political revolution in this country,” a jubilant Mr Sanders said after topping the popular vote in the Granite State with 25.7 per cent.

“This is what it will take to defeat Donald Trump,” he added.

Mr Sanders’s White House campaign is on a roll, with success in New Hampshire coming soon after he won the popular vote in the shambolic Iowa caucus last week.

He is emerging as the Democratic Party frontrunner for the nomination to take on Mr Trump in November’s presidential election.

It was another bad night for the party establishment, with former vice-president Joe Biden, once seen as the favourite, trailing in fifth place with just 8.4 per cent of the vote.

Amy Klobuchar was the surprise performer in the caucus, finishing in third place on 19.8 per cent of the vote, just behind Pete Buttigieg, who polled 24.4 per cent.

Elizabeth Warren, who many pundits saw as a potential rival to Mr Biden for the candidacy, came fourth with 9.2 per cent of the popular vote.

Both walked away from the New Hampshire vote with no delegates to the electoral college, having failing to cross the 15 per cent threshold.

Senior Democrats fear success for Mr Sanders, who has faced a series of bitter attacks and smears from rivals. 

Hillary Clinton, who lost to Mr Trump in 2016, claimed — in an interview seemingly devoid of self-awareness — that no-one likes Mr Sanders or wants to work with him, failing to understand that the democratic socialist’s popularity comes from precisely his dissimilarity to the party machinery.

Former Goldman Sachs chief executive Lloyd Blankfein, in a hysterical tirade, warned that Mr Sanders would wreck the economy and let Russia “screw up the US.”

In his victory speech, Mr Sanders declared: “Our victory tonight is the beginning of the end for Donald Trump,” vowing to transform the country by building a mass, multiracial and multigenerational working-class movement to overthrow the status quo.

He added: “This victory isn't about me; it’s about us. Tonight is about what our supporters, volunteers and grassroots donors built in New Hampshire.”

The next caucus takes place in Nevada on February 22.