WASHINGTON (AP) – The government’s top infectious disease expert says the next few weeks are critical to tamping down a disturbing coronavirus surge in the U.S. Dr. Anthony Fauci issued a plea Tuesday for people to avoid crowds and wear masks, just hours before mask-shunning President Donald Trump was set to hold a campaign rally in one hot spot, in Arizona. Despite controversy over Trump’s comments that testing is finding too many infections, Fauci told a congressional committee that testing hasn’t slowed – and the country will be doing even more.