You'll have heard a lot of commentary in recent days saying that Joe Biden's election is a disaster for Boris Johnson. I decided to speak to US diplomats, Biden's team and government officials on both sides and concluded that this simply isn't true https://edition.cnn.com/2020/11/10/world/biden-boris-uk-us-relationship-gbr-intl/index.html
What is true is that there is a perception in the US that Johnson is a Trumpian-style politician; what's also true is that Biden is a looking to secure the US' relationship with allies incase Trump 2.0 happens again later down the line https://edition.cnn.com/2020/11/10/world/biden-boris-uk-us-relationship-gbr-intl/index.html
The PM's team has reason to be nervous. The window to get off to a good start with Biden will be small & the biggest test, Brexit, must be settled before Biden even takes office. Flip side, once Brexit is settled, there is a lot for the allies to agree on https://edition.cnn.com/2020/11/10/world/biden-boris-uk-us-relationship-gbr-intl/index.html
That is why the PM and his advisors have been briefing that they are looking forward to working with Biden in the coming weeks and that there was actually relief that a more stable leader will be in the White House, even at the risk of pissing off Trump https://edition.cnn.com/2020/11/10/world/biden-boris-uk-us-relationship-gbr-intl/index.html
Tl;dr: the goodwill really is there from team Biden. The difficult Johnson faces is that he has to make a good impression in the time between now and Brexit day. https://edition.cnn.com/2020/11/10/world/biden-boris-uk-us-relationship-gbr-intl/index.html