Mr. Trump asked the South Korean president for as many kits as possible from the 100,000 produced daily there. However, "having the ability to diagnose the disease three months after it was first disclosed by China does little to address why the United States was unable to do so sooner, when it might have helped reduce the toll of the pandemic." One expert indicated the delay of testing adversely impacted other aspects of the coronavirus response. "Vox" reported that during the week of March 25 to April1, the U.S. was "performing about 110,000 tests per day". Several experts estimated that between 500,000 and "millions" of tests per day are necessary. There are many challenges to ramping up capacity: "Complaints vary, but labs say they don't have enough swabs, test kits, reagents, personal protective equipment (PPE), staff, or machines to run the specific tests required." Money and regulations are also challenges. President Trump alleges that the WHO mishandled the pandemic. He questioned why the WHO had recommended "keeping our borders open to China early on", advice he rejected. He mentioned the WHO was funded largely by the U.S., but was very "China-centric". AP reported that: "Dr. Anthony Fauci, the government's top infectious disease expert, said Tuesday that the U.S. does not yet have the critical testing and tracing procedures needed to begin reopening the nation's economy... Fauci said that a May1 target is 'a bit overly optimistic' for many areas of the country. Any easing off the strict social-distancing rules in place in much of the country would have to occur on a rolling basis, not all at once." President Trump announced his decision to halt U.S. funding to the WHO, alleging the U.S. would review alleged mismanagement and cover-up efforts. WHO officials disputed his allegations the following day, saying that: a) the world was alerted January 5; b) countries globally began to respond January 6; and c) WHO provided updates throughout the period. As of April 16, there were 639,664 confirmed coronavirus cases in the U.S., with 30,985 confirmed deaths, a 4.8% mortality rate. An estimated 3.24million tests had been conducted, indicating about 20% of those tested had coronavirus. As of April 30, "Our World in Data" reported that for the U.S. there were 60,966 total deaths, 1.04million confirmed cases, and 6.25million tests completed.