A federal judge is hearing arguments on whether military troops deployed this summer by the Trump administration to Los Angeles violated a federal law that bars troops from conducting law enforcement duties within the country.

After court battles led to unfavorable rulings on ICE tactics, birthright citizenship and other issues, the Trump administration appears ready to continuing pushing the limits of what judges will tolerate.

A three-day trial opened Monday in state officials’ challenge of the legality of the deployment, which followed protests over immigration raids.