In a rambling answer, Mr Johnson claimed he could not comment on whether Donald Trump’s successor was woke, but said:”What I know is that he’s a firm believer in the transatlantic alliance and that’s a great thing.
His remarks came after Labour’s shadow foreign secretary, Lisa Nandy, accused the prime minister of having “managed to trash” the UK’s reputation as a values-driven nation.
In an interview with The Guardian she praised Mr Biden as a “woke guy” who defends trans rights and the Black Lives Matter movement, saying he offered a possible model for electoral success for the Labour Party.
Ms Nandy suggested the Democratic former vice-president could serve as an inspiration for how a Labour leader could triumph without compromising on progressive values and being drawn into culture wars.
“Joe Biden – he’s a woke guy, he appointed an amazingly strong woman of colour who is also pro-choice as his running mate, he mentioned the trans community in his victory speech, he stood up for the Black Lives Matter protesters, he spoke out about the policing of that movement, and he’s never shied away from standing up for his values,” she said in the interview.
Mr Johnson’s enthusiastic embrace of the term woke may not be universally welcomed by some within the Conservative Party.
As recently as Sunday, the communities secretary, Robert Jenrick, decried “town hall militants and woke worthies” as he announced laws to protect monuments after the toppling of a statue of slave trader Edward Colston in Bristol.
Mr Johnson has also been perceived as being very un-woke, having used racial slurs such as “piccaninnies” and describing then-prime minister, Tony Blair, being met by “tribal warriors” with “watermelon smiles” on a trip to the Congo.
The prime minister once referred to gay men as “bum boys” and, in a 2018 newspaper column, described veiled Muslim women as “looking like letter boxes”.
His choice of language has also been raised as a potential grounds for friction with the incoming US administration.
Many were offended by his criticism of Barack Obama, who Mr Biden served as vice-president to, as having an “ancestral dislike” of Britain because of his “part-Kenyan” heritage when the then-president came out in support of the Remain campaign.