Why did Twitter suppress stories about Hunter Biden before the 2020 US election?

What happened on Twitter in the run up to the 2020 US Presidential election?It's a question Republicans are demanding answers to, as is Elon Musk.

The new owner of Twitter has fired James Baker, one of its most senior lawyers. Musk said he had been fired "in light of concerns about Baker's possible role in suppression of information important to the public dialogue."

This relates to the “Twitter Files” - internal files concerning Twitter's content moderation practices, including relating to the suppression of stories regarding the laptop of Hunter Biden, son of US President Joe Biden.

Newsnight's International Correspondent Joe Inwood reports.