Trump mocks Biden's use of virus face mask

US President Donald Trump, in a campaign rally in Pittsburgh on Tuesday, mocked his Democratic presidential rival Joe Biden for wearing a face mask in public.

''I mean, honestly, what hell did he spend all that money on plastic surgery if he's going to cover it up with a mask, seriously,'' he said.

Trump and Biden have been at odds over value of face masks as a defence against coronavirus.

President also accused Democratic party of being ''against oil, God and religion.''

He hit out at Democrats over climate change, and defended his decision in 2017 to withdraw United States from agreements reached during Paris climate talks.

''I withdrew from (Paris Climate Agreement) catastrophe because I was elected to fight for Pittsburgh, t for Paris,'' Trump told rally.

He also accused Biden of being too close to China.

"If Biden wins, China wins," he said. "When we win, Pennsylvania wins and America wins."