U.S. President Donald Trump examines a coronavirus testing kit as he prepares to speak during the daily coronavirus response briefing in the Rose Garden at the White House in Washington, U.S., Mar 30, 2020. (Photo: REUTERS/Tom Brenner)

WASHINGTON: US President Donald Trump said on Monday (Mar 30) that federal social distancing guidelines might be toughened and travel restrictions with China and Europe would stay in place as he urged Americans to help fight the coronavirus with tough measures through April.