A federal judge in Pennsylvania ruled in favor of President Donald Trump‘s use of the Alien Enemies Act, marking the first time a judge has approved of the centuries-old law as a tool for expediting deportations of some illegal immigrants.

Judge Stephanie Haines of the U.S. District Court for the Western District of Pennsylvania gave Trump his first ruling accepting his assertion that the Venezuelan gang Tren de Aragua is committing a “predatory incursion,” a requirement for invoking the Alien Enemies Act. Several other federal courts have rejected Trump’s efforts to use the 1798 law, but Haines, a Trump appointee, found his March proclamation “sufficient.”