Mixed Picture for Stocks, China News Conference Coming, Twitter Flags Trump, Bristol Myers CEO

<p>Carl Quintanilla, Jim Cramer and David Faber discuss the mixed picture for stocks on the last trading day for the month of May. Investors are bracing for a news conference on U.S. – China relations from President Trump this afternoon. And a battle between the President and social media companies heating up. Twitter flagging a tweet from the President on Minneapolis saying it’s quote, “glorifying violence.” Plus, the CEO of Bristol Myers joins “Squawk on the Street” to discuss the development of a vaccine for Covid-19.</p>