What has happened so far?
In late 2019, US President Donald Trump was "impeached". Impeachment proceedings are a rare event in the US and are a final check on the president's power. The United States Congress, the part of the US government that writes and brings in laws - can put certain senior American officials like the president on trial.
He was accused of seeking help from Ukraine's government to help himself get re-elected this November. He's alleged to have held back millions of dollars of military aid to Ukraine, until they publicly announce an investigation into Joe Biden, the man who might be challenging him in the 2020 Presidential election.
After someone is impeached, they then go on trial in the Senate - (a part of Congress). The politicians in the Senate decide whether they are guilty or not. It's a political trial not a criminal one.
This is a very big deal in the US - only two presidents before Donald Trump have been impeached.
What's the latest?
Donald Trump was acquitted of both charges in his trial and so will remain as President at least until the election in November of this year. You can read more here and also find out why 4 numbers led to his acquittal here.
There's a simpler version here, from Newsround.
How can I have my say?
By commenting on this post! This will be the place for discussion about the trial and what's happening. We'll update links and show you where to find out the latest.