Donald Trump has been caught on video attending a dinner with key figures at the centre of a growing controversy over alleged Russian interference in the US presidential election.

The video, released on Wednesday by CNN, was shot on June 15, 2013, on the eve of the Miss USA pageant, according to the network, which described it as offering "fresh insights into the warm relationship" between Mr Trump and the Azerbaijani-Russian Agalarov family.

It shows the future US president in animated conversation with billionaire Aras Agalarov, his popstar son Emin and Emin's publicist Rob Goldstone, whose email exchange with Mr Trump's eldest son Donald Jr has been described in some quarters as a possible "smoking gun" in the ongoing investigation into whether the Republican's campaign colluded with Moscow to get him elected.