Once upon a time, back in 1916, there was a guy named Doroteo Arango (aka Pancho Villa) raiding across the border and retreating back into Mexico. Woodrow Wilson sent the Army (Brigadier General Pershing in command) into Mexico in pursuit of Villa with the reluctant agreement of the Mexican president. Sounds great, but the rules of engagement were so restrictive that Pershing's troops were all but hamstrung.
I hear that history repeats itself. Something to think about?