US President Donald Trump on Tuesday called for a unified national response to the coronavirus threat, after coming under fire for downplaying the pandemic and allowing states to go their own way.Trump's call came as Treasury Secretary Steven Mnuchin said the White House was presenting a massive economic stimulus plan to Congress and was looking at sending direct payments to all Americans, as well as aid to embattled airlines.In a White House appearance that was striking for its mostly measured and sober tone, Trump praised the Democratic governors of New York and California and excoriated states that were not adhering to strict new guidelines on social distancing."We are looking to save the maximum number of lives. Everything else is going to come back, but a life is not going to come back," Trump said.The number of US cases has surged to more than 5 600 with 94 deaths, according to a tracker maintained by Johns Hopkins University.UrgencyThose figures seemed to be driving a sense of urgency as schools close their doors, businesses shift to teleworking and hospitals prepare to meet a wave of expected patients.Trump has been repeatedly accused of underplaying the pandemic, particularly in its early stages, in order to avoid spooking the markets.But he no longer appeared to be using that playbook and hailed a markedly improved feeling of bipartisanship."It's been a great thing to see...getting along with Democrats, getting along with Republicans," said Trump. "There's been a lot of spirit with things happening that I haven't seen in almost three and a half years."Most cases in New York The US Centers for Disease Control and Prevention (CDC) on Monday issued new guidelines to be followed for up to two weeks, advising against gatherings of more than 10 people and urging against visiting public spaces like restaurants or gyms.That led to criticism of public officials who had just days earlier called for people to go about their daily lives -- including Oklahoma Governor Kevin Stitt and Californian congressman Devin Nunes, both Republicans.Democratic presidential primaries nevertheless went ahead Tuesday in three states -- Florida, Illinois and Arizona.A top coronavirus task force official, Deborah Birx, said: "We believe that every mayor and every governor should implement these guidelines that came from the White House and the President of the United States."Trump then chimed in: "And we've been very tough on those states, I know exactly who you're talking about, we've been very tough on them," without naming names.And he praised Governor Andrew Cuomo of New York and Gavin Newsom of California, saying of the former: "We're both doing a really good job and we're coordinating."The world is at war with a hidden enemy. WE WILL WIN!— Donald J. Trump (@realDonaldTrump) March 17, 2020 The US epidemic had been centered on northwest Washington state, but new figures issued overnight now give New York state the highest number of cases with almost 1 400.Cuomo warned reporters Tuesday the epidemic may not peak for 45 days and said experts had told him the state would need to devote 55,000-110,000 hospital beds to the crisis, including tens of thousands in intensive care units.Asked his views on when the national epidemic was set to peak, Anthony Fauci, the head of infectious diseases at the National Institutes of Health, told reporters at the White House 45 days "is not unreasonable.""From our standpoint, from the federal government, we're talking about a range," he added, saying the taskforce would evaluate if even more draconian measures were required in the next two weeks.And he called for young people to play their part by remaining at home even if they themselves were not particularly vulnerable to the illness."You don't want to put your loved ones at risk, particularly the ones who are elderly and the ones who have compromised conditions," he said. "We can't do this without the young people cooperating, please cooperate."'Very accurate' Trump's administration is drawing up a massive emergency spending package while the Federal Reserve has opened the floodgates of financing to contain the growing economic damage from the coronavirus pandemic.The president called for bipartisan support for rushing out immediate cash payments to American families.Trump did not specify a total for the stimulus package, but The Washington Post said it could amount to $850 billion.While Tuesday's appearance by the president signaled a shift in rhetoric -- there was one area where he remained particularly combative, doubling down on referring to the pathogen as the "Chinese virus" despite objections from Beijing."It did come from China, so I think it's very accurate," he said, indicating it was payback for a Chinese disinformation campaign that called the virus a US bioweapon.