President Trump ends news conference after contentious exchange with reporter

President Trump abruptly ended his news conference after a Chinese American reporter asked him why he always says the U.S. is doing far better when it comes to testing for than any other country. "Maybe that's a question you should ask China, don't ask me, ask China that question, OK?," Trump told the reporter. Andrew Yang, a former Democratic presidential candidate and Biden supporter, joins AC360 to react to the President's comments. Plus, the biotech company Regeneron says it will start clinical trials for a possible COVID-19 treatment. The company's Chief Scientific Officer, Dr. George Yancopoulos, tells Anderson Cooper how this treatment would work on patients with coronavirus. Airdate: May 11, 2020

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