announcer: additional funding is provided by -- the estate of arnold adams. and koo and patricia yuen through the yuen foundation.it coed to bridging cultural differences in our communities. the corporation for public broadcasting and by contributions to your pbs station from viewers like you. thank you. once again, from washington, moderator robert costa. bert: good evening. we begin tonight with the rapidly unfolding story here in shington. leaders at both ends of pennsylvania avenue are now confronting a test to the american system.ai uncey has gripped institutions and sentors. health care, the economy, national security, and politics. president trump declared a national emergency on friday. two days after addressing the coronavirus. the novel president trump: the action i am tllaking wipen up access to up to $50 billion for states and territories and localities our shared fight against this disease. we're announcing a new partnership with private sectto vastly increase and accelerate our cacity tofo test the coronavirus. we want to make sure that those wh