In an article for TheHill.com, Nolan Rappaport, an immigration expert, wrote:

The pertinent provision states when it’s been determined that a person has a credible fear of persecution, he “shall be detained for further consideration of the application for asylum,” and the Supreme Court held that this language “mandate(s) detention of aliens throughout the completion of applicable proceedings and not just until those proceedings begin.”

In other words, mandatory detention continues to apply until they have been granted asylum, deported, or – and this is key – they choose voluntarily to leave on their own.

If aliens placed in expedited removal proceedings have to be detained until they can be deported or are granted asylum, most of them will go home rather than stay at a detention center on a military base for several years with no realistic hope of being granted asylum.

An October 15 statement from the D.C.-based Immigration Law Reform Institute said the Supreme Court’s 2018 Jennings v. Rodriguez decision confirms that Sessions has the legal authority to bar the judges from releasing migrants. The IRLI said:

In the 2018 decision Jennings v. Rodriguez, the U.S. Supreme Court confirmed that the 1996 immigration law requires that all unlawful entrants must be detained while their removal cases are heard. IRLI explains in its brief how this ruling closes the above catch-and-release loophole: detained aliens may still request release from custody, but under almost no circumstances will immigration judges have discretion to grant such requests.

“If aliens show up with no documents or lie to American immigration inspectors, the Supreme Court has made clear that an immigration judge no longer has discretion to release them unless and until they win their case for admission,” explained Dale L. Wilcox, IRLI executive director and general counsel. “We continue our enthusiastic support of Attorney General Jeff Sessions as he works tirelessly to repair the damage that this and other Obama-era ‘catch-and-release’ policies have inflicted upon our immigration enforcement system.”
Sounds good to me. This catch & release crap has got to end! If more detention centers is what's needed as an alternative to the current catch & release plan, I'm all for it!

I know some people on here don't believe we need more detention centers because they think we can stop them from coming. Well, the reality of the current situation is they are coming and so far we haven't been able to stop them, so we must deal with what's in front of our face at the moment and that means doing whatever is necessary to stop catch & release.