Trump is so fond of wide-ranging executive orders, if he really wants to disavow anti-Semitism, he should declare Neo-Nazi groups and the Klan to be terror groups, and lump them in with ISIS and Al-Qaeda. I should think that it would go over well for Republicans or Democrats, since the vast majority of Americans find extremism repellant.

Let the alt-right make the case that they are non-violent, law-abiding citizens, and not violent, hate filled murderers, the way that they insist that ordinary, American Muslims do.