The U.S. Justice Department signaled support for legislation to extend by seven months a ban on illegal copycat versions of fentanyl, the powerful synthetic painkiller that has helped fuel the nation’s opioid epidemic.

A U.S. judge upheld two patents relating to Amgen Inc.’s blockbuster rheumatoid arthritis drug Enbrel, denying a challenge by Novartis AG, which is seeking to launch a copycat version.

Lawmakers on the U.S. Senate Judiciary Committee urged the Trump administration to conduct a scientific review of a Justice Department-backed bill to classify all illicit chemical knockoffs of the potent painkiller fentanyl in the same legal category as heroin.