Most of them will not be allowed in, there is no way they are refugees.
Bingo. The UN would agree in that the actors are not "forcibly displaced communities and stateless people". Nor is this well-dressed, well-fed political demonstration entitled to humanitarian aid.
The problem is that just as the U.S. takes a voter's unsupported declaration of citizenship as proof of eligibility to vote in federal elections, the U.S. has been historically unwilling to secure its borders. The statutes in place to protect both are incomplete or ignored.
The next civil war may well turn on rejection by many of conditions caused by fed officials who don't bother to enforce this nation of law's statutes.