Iowa caucuses: What Trump's dominant win means for his rivals

It was perhaps the least surprising victory in the history of the Iowa caucuses.

Donald Trump won by a landslide in the first contest in the Republican race for a presidential nominee, the margin in the end as comfortable as the polls had predicted for months.

But dominating the vote count was just one reason why the former president was celebrating on Monday night after his supporters braved extreme cold weather to deliver him the win.

Neither of Mr Trump's main rivals, Nikki Haley nor Ron DeSantis, emerged as a lead challenger - so the not-Trump vote remains divided. Meanwhile, his most ideologically similar rival, Vivek Ramaswamy, announced he was dropping out - and will endorse Mr Trump in New Hampshire on Tuesday.