WASHINGTON—Since President Trump took office on Monday, he has issued a flurry of directives to expedite the removal of millions of undocumented immigrants from the U.S.Immigrant groups are bracing for large raids,

President Donald Trump has already inundated the country’s immigration system with enough changes to create immediate impacts along the border and across American cities.

Shortly after taking office, President Trump issued 11 executive orders cracking down on illegal immigration. The orders target what he sees as an invasion at the southern border and significantly alter how the U.