A charter bus company hired by the state of Texas to transport migrants to Chicago is trying to flip the script on the border crisis in a federal lawsuit against the city alleging that its ordinance banning unannounced migrant drop-offs is unconstitutional and punishes transportation companies working with Texas, court documents show.

Wynne Transportation LLC is fighting new restrictions in Chicago against buses dropping off one-way passengers without prior notice.

The ordinance does not specifically mention immigration, but city leaders have acknowledged it is in response to the influx of more than 30,000 migrants arriving from Texas on government-contracted charter buses, often dropped off on street corners with little or no notice.