Hillary Clinton has clinched the Democratic nomination for US president after reaching the required number of delegates, an AP tally suggests.

A state department inquiry has accused Hillary Clinton and other former US secretaries of state of poorly managing email security.

US Democratic presidential candidate Hillary Clinton has said her primary race against Bernie Sanders is effectively over.

Democratic presidential candidate Hillary Clinton declares victory in Kentucky as she tightens her grip on the presidential nomination.

Both Ted Cruz and John Kasich have fallen by the wayside, while Donald Trump dashed to the finishing line of Republican Party nomination for the US presidential race in 2016.

Republican Donald Trump pulled even with Democratic rival Hillary Clinton in a Reuters/Ipsos opinion poll released on Wednesday, in a dramatic early sign that the Nov. 8 presidential election might be more hotly contested than first thought.

Bernie Sanders has won the West Virginia primary in the Democratic race for the presidential nomination, US media project.

Donald Trump wins presidential primaries in all five north-eastern US states voting while Hillary Clinton takes four.

Donald Trump wins the Republican presidential primary in New York while Hillary Clinton has triumphed in the Democratic race.

Donald Trump has won the Republican presidential primary in New York while Hillary Clinton has triumphed in the Democratic race.

Hillary Clinton and Bernie Sanders come to blows in a heated US presidential debate in Brooklyn, raising the stakes in their increasingly acrimonious race to clinch the Democratic nomination.

Democratic presidential contender Bernie Sanders easily wins nominating contests in Alaska and Washington on Saturday, chipping away at front-runner Hillary Clinton's commanding lead in the race to pick the party's candidate for the White House.

Donald Trump winning the US presidency is considered one of the top 10 risks facing the world, according to the Economist Intelligence Unit.

The race for the Republican presidential nomination continues after Donald Trump wins a decisive victory in the key state of Florida but lost to John Kasich in Ohio.

The Grand Old Party does not know how to stop Trump and it is their fault. Throughout history it's a party that has won elections mostly on anti-government rhetoric.

Donald Trump wins two more states, Michigan and Mississippi, in his bid for the White House.

What a bizarre spectacle the US presidential primary campaigns are unfolding into! There is a lovefest among Democrats who cannot decide who they love more - Hillary Clinton or Bernie Sanders.

Bernie Sanders has beaten Hillary Clinton in the Maine caucuses, the latest contest in the battle to be the Democratic presidential candidate.

Senior Republicans are speaking out against front-runner Donald Trump after his seven-state victory in the race for the party's presidential pick.

Donald Trump and Hillary Clinton each take a giant step toward securing the White House nominations of their parties Tuesday, thumping rivals in a slew of "Super Tuesday" primaries.