BRIEFING UPDATES:

-184 countries have coronavirus cases, said President Donald Trump.

-British PM Boris Johnson "seems to be doing better," according to Trump. 

-Secretary of State Mike Pompeo says 50,000 stranded Americans have been brought back home to the U.S.

-No sanctions are preventing medical supplies from going to Iran, Pompeo said. But they did not accept the U.S's help, he said.

-11 million N95 masks have been delivered to hot spots, including 6.6 million to New York and New Jersey, said Trump.

-300 million new face masks will be delivered in May and June.

-10 drugs are now in clinical trials, said Trump. 

-Trump said he learned of the severity of the virus shortly before closing flights to and from China.

-"It would be nice to open [the country] with a big bang," said Trump. He said he would "rely really heavily" on medical experts' opinion before opening country back up.

-More than 400,000 Americans have tested positive and 14,000 have died, said Vice President Mike Pence.

TRACKER: New York, New Jersey, Connecticut coronavirus cases and deaths

PHOTOS: The impact of coronavirus around the world