You can always count on Trump to exploit any tragedy as an excuse to smear and stigmatize a vulnerable group. In the wake of the shooting in D.C. of two national guard members, Trump of course wasted no time in blaming Afghani nationals collectively, and calling for a halt to all further migration from that war-torn nation (even though U.S. intervention over decades is a large part of what made it so war-torn).
Now, on Thanksgiving weekend, Trump has broadened his attack to include immigrants of every nationality and legal status. Borrowing a term from European white nationalists, Trump called openly on social media for "reverse migration"—a term that in Europe is generally understood to refer to a call for the ethnic cleansing of non-white people from the continent, regardless of their citizenship status.