President Donald Trump's revised travel ban has suffered another federal court setback after a judge in Maryland rejected a revised measure that bans travel targeting six predominantly Muslim countries.

Judge Theodore Chuang ruled Thursday in Greenbelt, Maryland, in a case brought near the nation's capital by the American Civil Liberties Union and other groups representing immigrants, refugees and their families. The groups argued that the underlying rationale of the ban was to discriminate against Muslims, making it unconstitutional.

Chuang granted a preliminary injunction on a nationwide basis. He declined to issue an injunction blocking the entire executive order, saying that the plaintiffs didn't sufficiently develop their argument that the temporary ban on refugees offends the establishment clause and didn't provide sufficient basis to establish the invalidity of the rest of the order.

He called Trump's own statements about intentions to impose a Muslim ban "highly relevant." Trump's second executive order does include changes from the first order, Chuang noted, such as the removal of a preference for religious minorities in the refugee process.

"Despite these changes, the history of public statements continues to provide a convincing case that the purpose of the Second Executive Order remains the realization of the long-envisioned Muslim ban," he said.

Details of the implementation of the orders also indicate that national security isn't the primary purpose of the ban, Chuang said.

"The fact that the White House took the highly irregular step of first introducing the travel ban without receiving the input and judgment of the relevant national security agencies strongly suggests that the religious purpose was primary and the national security purpose, even if legitimate, is a secondary, post hoc rationale," he said.