US president is recorded on hot mic singling out Beijing, saying it ‘continues to behave aggressively’ in areas including the South China Sea

Joe Biden has been recorded on a hot mic telling the leaders of Australia, India and Japan that an aggressive China is “testing us”, in remarks at a Quad summit that risked undercutting the group’s declaration that carefully avoided referring to Beijing by name.

The comments came as Biden opened a farewell summit in his home town of Wilmington, Delaware, with Indian prime minister Narendra Modi, Japanese prime minister Fumio Kishida and Australian prime minister Anthony Albanese.