Tuesday briefing: What Trump’s triumph tells us about the state of the presidential race

In today's newsletter: The first real results of the 2024 presidential campaign are a hammer blow to Ron DeSantis and Nikki Haley

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Good morning. Last night, the race for the US presidency formally started - and Donald Trump has won the first round by a landslide. With 99% of votes counted, Trump has 51% of Republican support in the Iowa caucus - a victory of unprecedented dominance for any race not involving a sitting president.

Ron DeSantis got 21% of votes, a very distant second place that he tried to present as a success - while Nikki Haley finished a disappointing third with 19% but claimed she now had the momentum to challenge Trump. In truth, though, the result is so decisive that it's all but impossible to see anyone but Trump taking the nomination from here.

Conservatives | Rishi Sunak is facing a Conservative meltdown over the Rwanda deportation bill after two deputy chairs said they would support rebel amendments aimed at blocking international human rights laws. Lee Anderson and Brendan Clarke-Smith have defied the prime minister by backing rightwing challenges to the bill, which will be debated by parliament on Tuesday.

Middle East crisis | The Houthi militia group has continued to attack commercial shipping, hitting an American-owned container ship with a ballistic missile in defiance of US and UK strikes on Yemen. While the strike caused no major damage, it will add to fears that the militia group retains the ability to threaten commercial shipping.

Rail strikes | Train drivers have called a further week of rolling strikes across England from late January in their long-running dispute with operators over pay. Members of the Aslef union will strike for 24 hours at each train-operating company on the national railway on different days between Tuesday 30 January and Monday 5 February.

Security | Hizb ut-Tahrir will be banned from organising in the UK following claims that the group is antisemitic, the home secretary has said. The Islamist group is already banned in several countries including Germany and Indonesia.

Emmys | Beef, The Bear and the final season of Succession reigned supreme at the delayed 2023 Emmy awards. Jesse Armstrong's hit HBO drama picked up six awards, including for actors Kieran Culkin, Sarah Snook and Matthew Macfadyen and the night's biggest award for best drama series. See the red carpet fashion and a full list of winners.