Health insurer Anthem Inc said on Tuesday that Cigna Corp could not unilaterally terminate an agreement between the two companies to merge.
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"Under the terms of the merger agreement, Cigna does not have a right to terminate the agreement. Therefore, Cigna's purported termination of the merger agreement is invalid," Anthem said in a statement.
Cigna had said earlier on Tuesday that it would terminate the planned deal after a federal judge ruled on Feb. 8 that the deal was illegal under antitrust law.