Marshalling – arrange or assemble (a group of people, especially soldiers) in order.
Mr Trump also announced plans to provide billions of dollars in loans to small businesses, in an attempt to stymie the effect of the coronavirus outbreak on the US economy.
He also urged Congress to pass major tax relief measures as part of an “aggressive and comprehensive effort” to combat the virus.
“We are marshalling the full power of the federal government and the private sector to protect the American people,” he said.
Flights from European countries other than the UK will be suspended for 30 days, the president says.