Why is it important to call them INVADERS, what the Left will absolutely NOT call them? Because that is what they are AND the Supreme Law of the Land, The Constitution, MANDATES the Federal gov't to STOP INVASION.
The United States shall guarantee to every State in this Union a Republican Form of Government, and shall protect each of them against InvasionUS Const., Art IV, Sec. 4.
Illegal aliens works for me, too.