From another article about this that quotes a bit of the ruling.

In his decision, Moss ruled that neither the Immigration and Nationality Act nor the Constitution give the president and administration officials “the sweeping authority” asserted in his proclamation and subsequent guidance implementing the directive.

“The court recognizes that the executive branch faces enormous challenges in preventing and deterring unlawful entry into the United States and in adjudicating the overwhelming backlog of asylum claims of those who have entered the country,” he wrote. “But the INA, by its terms, provides the sole and exclusive means for removing people already present in the country.”

Moss said that a pair of provisions of federal immigration law do not provide “the president with the unilateral authority to limit the rights of aliens present in the United States to apply for asylum.”

He further found that the Constitution does not give the president the authority to “adopt an alternative immigration system, which supplants the statutes that Congress has enacted and the regulations that the responsible agencies have promulgated.”

Oh that’s gonna get under his skin. There will be catsup on all the walls today.