House Speaker Nancy Pelosi responded to President Donald Trump’s decision to delay the deportations of a few hundred recent illegal migrants by asking for a nationwide amnesty for millions of migrants living in the United States. “Mr. President, delay is welcome,” she tweeted, adding, “Time is needed for comprehensive immigration reform.” In recent weeks, Democrats have been stepping up their calls for “comprehensive immigration reform,” usually by praising the 2013 “Gang of Eight” amnesty and cheap-labor bill. Democrat’s use of “comprehensive immigration reform” is shorthand for a political deal that would promise better border security for Americans in exchange for...