The day before it is supposed to go into effect President Donald Trump’s revised travel ban will be scrutinized in federal courtrooms across the country on Wednesday.

In Maryland, a U.S. judge will hear arguments from the American Civil Liberties Union and others who want to stop the new directive and more than a half-dozen states are trying to derail the executive order affecting travelers from six Muslim-majority nations.

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Michael McConnell, a constitutional law professor at Stanford Law School, has said he is “highly skeptical” that states can sue over this issue.