US Republican candidates to face off in Iowa

The race for the 2024 Republican White House nomination is heating up.

Several big-name and dark-horse contenders have joined an increasingly crowded field in recent weeks.

All are seeking to unseat the current front-runner, former President Donald Trump, who continues to dominate in national opinion polls.

The eventual winner will challenge the presumptive Democratic nominee, President Joe Biden, in the general election of November next year.