Adams, who faces challenges from New York City Comptroller Brad Lander and others in his reelection bid next year, filed a lawsuit against 17 charter bus companies in January.

His goal was to stop the companies from busing migrants, many of them undocumented, from communities in Texas to New York. The mayor cited Social Services Law 149, which stipulates that any person "who knowingly brings, or causes to be brought, a needy person from out of state into this state for the purpose of making him a public charge" has an obligation "to convey such person out of state or support him at his own expense."

But in her nine-page July 29 ruling, Judge Mary V. Rosado found that the lawsuit was "unconstitutional."

The judge found that the matter was similar to a 1941 Supreme Court case, Edwards v. California, in which the Supreme Court found that an "essentially identical" law in California was unconstitutional for violating the Interstate Commerce Clause.

She cited the ruling, saying, "The Court finds that it cannot grant the ... request for injunctive relief as the merits of [the] claim are dubious at best given myriad constitutional concerns."

The state supreme court's ruling is a setback for the Adams administration, whose legal moves had succeeded in getting one bus company, Roadrunner Charters Inc., to enter into an agreement to pause busing migrants to the city until the court reached a decision. Now, Roadrunner Charters and other bus services are free to continue transporting migrants to New York.

Texas Gov. Greg Abbott quickly responded to the ruling on X,  formerly Twitter, writing, "Another WIN! ... Until the Biden-Harris Administration secures the border, Texas will continue to send migrants to sanctuary cities."

Adams's position was that dropping thousands of people in New York strained social services and the amount of available shelter space past the limit, costing more than $700 million. In a similar spirit to the busing lawsuit, the mayor has sought to enforce a 60-day limit on shelter space for asylum seekers in the city.