The US Senate has started an impeachment trial against President Donald Trump who is accused of abusing his power and obstructing Congress. It's only the third such trial in US history.

Mr Trump is accused of pressuring Ukraine to dig up damaging information on one of his main Democratic challengers for the presidency in 2020, Joe Biden, and his son Hunter.

The impeachment process kicked off in September after a formal complaint from a whistleblower - an unnamed intelligence official who wrote a letter expressing concern about Mr Trump's 25 July call with President Volodymyr Zelensky.

President Trump, who is a Republican, strongly denies any wrongdoing.

Video by Tristan Cimini and Shrai Popat