Trump also insisted during the address that for the “vast majority of Americans, the risk is very, very low,” reiterating assurances that have been shot down by his own health officials. There remain many unknowns about the virus and the disease it causes, COVID-19, which could possibly spread far and wide in the U.S. and overwhelm health systems. While studies so far have found over 80 percent of cases result in only minor symptoms, the fatality rate is subject to numerous factors and has ranged from between 0.5 percent in South Korea to 3.4 percent worldwide. Trump accurately noted that the “highest risk is for elderly population with underlying health conditions” and that they should be “very, very careful,” saying the White House is advising nursing homes to shut down unnecessary visits and that older Americans should avoid unnecessary travel.

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It’s not clear whether stopping most travel from Europe will actually do anything to halt the spread of the virus stateside, since the virus is already spreading locally here and likely has been for weeks. Even assuming that travelers don’t simply reroute through airports without restrictions or that cases won’t come in from outside Europe, the suspensions could prove meaningless in the face of sustained local outbreaks. Centers for Disease Control and Prevention director Robert Redfield said on Wednesday that the virus is in at least 38 states and Washington, DC. Halting the spread of the virus will now rely more on social distancing, in which Americans take steps to limit contact others, including working from home, canceling events with large numbers of expected attendees, and ramping up testing, which the U.S. is still lagging far behind on.

“When you’re dealing with an influenza virus-like transmissions, it’s like trying to control the wind,” Center for Infectious Disease Research and Policy at University of Minnesota director Michael Osterholm told Fortune. “People may want to try to limit their time in large crowds, but I don’t think that a domestic limitation on travel is going to help at all.”

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“This virus is already all around the country,” Osterholm added. “Think of this like seasonal influenza. We have regions that in any given week have more activity than other regions, but by the time the entire season is done, it’s covered the entire country. And when was the last time anyone thought of quarantining the United States for seasonal influenza?”

Trump also announced measures to try to prop up the economy in response to the coronavirus, though they mostly centered around Republicans’ laser-focus on tax cuts. Those included Treasury Department tax payment deferments, plans to introduce a payroll tax cut, and increasing the Small Business Administration’s loan program by $50 billion.

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“The virus will not have a chance against us,” Trump said. “No nation is more prepared or more resilient than the United States. We have the best economy, the most advanced health care, and the most talented doctors, scientists and researchers anywhere in the world. We are all in this together.”

Update: 3/12/2020 at 12:55 a.m. ET: This post has been updated to clarify that the travel suspension only applies to those non-exempted foreign nationals who have been in the Schengen Area in the last 14 days, not “all” travel as the president explicitly said in his speech.

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We’re sure it is possible the White House regrets the error.