Well slick, I believe they have been on the border to prevent them from crossing.
Dallas Parkland is an illegal alien birthing factory, which puts out about 900 new illegal alien mommies every single month, at just one hospital...All with the support of your government.
Multiply that by *hundreds* of hospitals all over the US...Been going on many years. It should to make most Americans recoil.
So save save your pie in the sky "Their being prevented from crossing" bit.