Ex-Clinton aide: 84 percent of Americans support turning undocumented immigrants over to authoritiesProminent Democratic pollster Mark Penn said on Thursday that a vast majority of Americans don’t really support so-called sanctuary cities that shield immigrants in the country illegally from deportation. Penn, who served as chief strategist for Hillary Clinton's 2008 presidential campaign, revealed that 84 percent of Americans favor turning undocumented immigrants over to federal agents. President Trump has made sanctuary cities a frequent target during his administration, arguing that they make the U.S. less safe. De Blasio called the order a "racist assault" on sanctuary cities. A federal appeals court on Tuesday temporarily narrowed the scope of a nationwide injunction against the Trump administration's attempt to withhold grants from sanctuary cities.