Pressure is building on Vermont Senator Bernie Sanders to give up his fight for the Democratic presidential nomination.

Cyber attackers are targeting the campaigns of Democratic and Republican presidential contenders, US Director of National Intelligence James Clapper said Wednesday.

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

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.

Some people run simply out of ego or greed. The publicity that attends a presidential bid can garner even a failed candidate a book contract, a television gig, or a well-paid speaking career (or perhaps all three). Trump ran on the basis of his celebrity.

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

Donald Trump, the US real estate tycoon-turned-presidential candidate, topped himself not so long ago - no mean achievement - by outraging the entire world with his demand to ban the entry of Muslims into the US.

White House hopeful Hillary Clinton calls for global unity to crush the Islamic State group, as the carnage in Paris took center stage at Saturday's Democratic presidential debate.

Hillary Clinton says she and her family paid a State Department staffer with personal funds to maintain a private email server that she used for both personal and government matters while secretary of state.