Ted Cruz was booed by furious delegates for refusing to endorse Donald Trump, undermining calls for Republican unity.

Ted Cruz, who knew all the election rules of the GOP, failed to top Trump, while Hillary Clinton was almost toppled by a socialist. The rules are changing and so are the voters, writes Ross Barkan

Donald Trump has all but clinched the Republican US presidential nomination with a resounding victory in Indiana that knocked rival Ted Cruz out of the race and cleared his path to a likely November showdown with Democratic front-runner Hillary Clinton.

Republican Ted Cruz faces a high-stakes test for his slumping presidential campaign in Tuesday's Indiana primary, one of the last opportunities for the Texas senator to halt Donald Trump's stunning march toward the GOP nomination.

Ted Cruz's conservative crusade for the US presidency is fighting for its life amid an Indiana vote that could effectively end the Republican primary season.

Republican presidential contender Ted Cruz has tapped former technology executive Carly Fiorina as his running mate in the race for the White House.

Donald Trump has hit out at a collaboration between Ted Cruz and John Kasich aimed at unifying the anti-Trump vote in some remaining primaries.

Donald Trump has hit out at a collaboration between Ted Cruz and John Kasich aimed at unifying the anti-Trump vote in some remaining primaries.

Painstaking organisation and in-person campaigning paid off again for Ted Cruz. He won all 14 delegates at the Republican Party convention in Wyoming.

Republican Donald Trump has emerged from the Wisconsin primaries as a damaged front-runner following a crushing primary loss to rival Ted Cruz, deepening questions about the billionaire businessman's presidential qualifications and pushing the Republican Party toward a rare contested convention nomination fight.

Republican US presidential hopeful Ted Cruz has stormed to victory in the Wisconsin primary, denting front-runner Donald Trump's chances of capturing the party's nomination before its convention.

Republican Ted Cruz and Democrat Bernie Sanders are angling for victories in the Wisconsin presidential primaries that could give their campaigns a much-needed boost.

The GOP’s leading candidates for the US presidential nomination are the equally despised authoritarian billionaire Donald Trump and religious zealot Ted Cruz, says Bette Browne

Republican presidential candidate Ted Cruz has received a boost from former contenders Scott Walker and Jeb Bush.

The billionaire businessman extends his lead for the highly-contested Republican nomination.

In the US, Donald Trump was rounded on by his fellow Republican presidential candidates in a televised debate last night.

Donald Trump's rivals will get one more chance to challenge the Republican front-runner's grasp on his party's US presidential nomination in a head-to-head debate before next week's key Super Tuesday contests.

Ted Cruz, a fiery, conservative Texas senator loathed by his own party's leaders, swept to victory in Iowa's Republican caucuses, overcoming billionaire Donald Trump.

US presidential candidates vying for their party nominations are toning down attacks against their rivals opting instead for messages of reflection on the morning of the country’s Iowa caucuses.

Billionaire businessman Donald Trump has raised more questions about Ted Cruz’s eligibility to serve as US president, telling his rival that his birth in Canada leaves “a big question mark on your head”.

Donald Trump is likely to lose to Ted Cruz in the race to be Republican presidential nominee, writes John Bruton