Donald Trump’s crackdown on immigration while president — along with the effect of the COVID pandemic — has left the U.S. economy in critical need of workers, significantly hobbling growth, according to economists. Federal Reserve Chairman Jerome Powell has estimated that the economy is short an astonishing 3.5 million workers, and economists estimate half of those workers would typically be migrants allowed into the country, The Washington Post reported Thursday. “There is no question: We need more immigration,” Adam Ozimek, chief economist at the Economic Innovation Group, a bipartisan public policy organization, told the Post.