The Supreme Court is expected to rule by the end of June.
The court last year gave Trump an initial victory in the birthright citizenship context in a ruling restricting the power of federal judges to curb presidential policies nationwide.
Though arising from early-stage judicial rulings declaring Trump’s directive unconstitutional, the court’s ruling did not resolve its legality.
The court, which has a 6-3 conservative majority, has backed Trump on other major immigration-related policies since he returned to the presidency.
It let Trump expand mass deportation measures on an interim basis while legal challenges play out, such as ending humanitarian protections for migrants or allowing them to be deported to countries where they have no ties.
