Donald Trump takes to Twitter to insist that despite months of investigating, no proof has emerged that he colluded with Russia to tilt the 2016 presidential election in his favor.

Democrat Hillary Clinton becomes the first woman in US history to be nominated for president by any major party.

Donald Trump's fierce denunciation of Hillary Clinton was rife with distortion.

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

US House Speaker Paul Ryan says he will vote for the Republican presidential candidate Donald Trump in this year's election, despite their differences.

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

Republican presidential candidate Donald Trump appears to have softened his stance on temporarily barring Muslims from travelling to the US.

Presidential hopeful Donald Trump says the newly elected mayor of London would be an "exception" to his proposed ban on Muslims travelling to the US.

Republican presidential front-runner Donald Trump accuses China of "raping" the US, in renewed criticism of China's trade policy.

US presidential hopeful Ted Cruz is called "Lucifer in the flesh" by the former Speaker of the House of Representatives, John Boehner.

Ted Cruz nails down all 14 delegates up for grabs at the Republican Party convention in Wyoming.

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

Texas Senator Ted Cruz scores a commanding victory over Donald Trump in Wisconsin's presidential primary Tuesday, putting the Republican frontrunner on notice that his march to the nomination is not a done deal.

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.

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.

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

US presidential hopefuls Donald Trump and Hillary Clinton maintains their status as front-runners in the latest round of voting for their parties' nominations.