Chip Somodevilla/Getty Images Copyright: Chip Somodevilla/Getty Images

It's nearing 23:30 here in Washington, so we are going to wind down our live coverage of another busy day in US politics.

We started out explaining what was happening with the Democratic race for president in Iowa, and we ended it with President Trump's third State of the Union address.

Here's the latest from Iowa, where Monday's caucuses aimed to decide who Iowans wanted to run against Mr Trump:

After a chaotic voting process plagued by technical glitches, results are finally starting to come in

With 62% of the vote counted, Bernie Sanders appears to have won most votes

However, Pete Buttigieg has won the most precincts - and this is what matters

Former vice-president Joe Biden is trailing some way behind in fourth

Meanwhile, in Washington:

President Trump has delivered his State of the Union speech

It was an optimistic speech, in which he said: "The years of economic decay are over"

It was marked by moments of tension with Democratic House speaker Nancy Pelosi - he appeared to snub her handshake and then she tore his speech when he had finished

We'll be back tomorrow for live coverage of the ongoing impeachment trial into Mr Trump. See you then.