WASHINGTON – As the U.S. enters “what may well be the toughest and deadliest period of the virus,” President Joe Biden is putting forth a national COVID-19 strategy to ramp up vaccinations and testing, reopen schools and businesses and increase the use of masks — including a requirement that they be worn for travel.Biden also will address inequities in hard-hit minority communities as he signs 10 pandemic-related executive orders on Thursday, his second day in office. “We need to ask average Americans to do their part," said Jeff Zients, the White House official directing the national response. “Defeating the virus requires a coordinated nationwide effort."But Biden officials say they're hampered by lack of cooperation from the Trump.