The U.S. Supreme Court on Monday asked the Obama administration for its views on a controversial case that tests whether a U.S. Border Patrol agent violated the Fourth Amendment when he shot and killed a Mexican teenager standing on Mexican soil.

The high court’s action in Hernandez v. Mesa is a signal that the justices are interested in the dispute and could grant full review at a later date. Several U.S. government agencies were named parties at earlier stages of the case, but in the appeal now before the court, only the Border Patrol agent is named as a defendant.