The Democratic and Republican parties have made presumptive nominations of their presidential candidates, Hillary Clinton and Donald Trump.

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

Supporters and opponents of Republican presidential nominee Donald Trump clashes in the city of San Diego in California.

For Americans of nearly every race, gender, political persuasion and location, disdain for Donald Trump runs deep, saddling the Republican front-runner with unprecedented unpopularity as he tries to overcome recent campaign setbacks.

President Barack Obama has opened his final presidential campaign — against Donald Trump.

Presidential candidate Donald Trump briefly called for "some form of punishment" for women who have abortions, if it became illegal.

US Democratic hopeful Bernie Sanders has hit back after Republican front-runner Donald Trump said he had sent protesters to disrupt his rallies.

Donald Trump trains his fire on the protesters disrupting his rallies, branding them "thugs" and extremists, as White House rivals warned the Republican's heated rhetoric was dangerously fanning tensions.

Jeb Bush drops out of the US Republican presidential race after a disappointing finish in the South Carolina primary.

Ted Cruz fells long-time Republican frontrunner Donald Trump and Democrat Hillary Clinton was battled into a virtual tie with rival Bernie Sanders on Monday, as Iowans held the inaugural vote of the 2016 White House race.

Aides to Hillary Rodham Clinton at the State Department complain about the limitations of using email to discuss sensitive diplomatic information.