Lots of Supreme Court decisions. Some good, some bad. Bad one: Mullin vs. Al Otro Lado. Eliminates the right to seek asylum at the border. Hinges on meaning of "arrive in". I completely agree with Kagan's dissent, and her analysis of the meaning of the phrase here. But inhumanity will prevail.
The turnback policy, euphemistically called “metering,” allows immigration officers at border crossings to block asylum seekers from setting foot on U.S. soil.