Monday's Rose Garden event on coronavirus testing came to an end after US President Donald Trump was challenged by a reporter for CBS News.

CBS reporter Weijia Jiang, who is Asian-American, asked Trump why he was emphasising that the US was doing better than any other country when it comes to testing.

He told CBS reporter Jiang to "ask China" in response to her question at a White House press conference.

Why does that matter? Why is this a global competition to you if every day Americans are still losing their lives and we are still seeing more cases every day?” she asked.

“Well, they are losing their lives everywhere in the world,” Trump said. “Maybe that is a question you should ask China. Don’t ask me. Ask China that question. When you ask China that question you may get a very unusual answer-