A planned merger between insurers Anthem and Cigna is on the rocks, with a federal judge expected to block it.

Cigna said in a regulatory filing Thursday that it is going to look at its options after a court rules on the federal government’s lawsuit to block the deal over antitrust concerns. Anthem wanted to give more time for Cigna to decide whether it wanted to back out, issuing a regulatory filing on Thursday that extended a deadline for a termination agreement from Jan. 31 to April 30.