Aetna CEO defends merger with Humana in antitrust trial

WASHINGTON (Reuters) - Aetna Inc's chief executive denied on Friday that its withdrawal from some Obamacare exchanges was in retaliation for government efforts to halt its merger with Humana Inc , as he sought to convince a federal judge to approve the deal. The U.S. Justice Department sued to stop the $34 billion tie-up in July, saying that it and another insurance mega merger, Anthem Inc's planned purchase of Cigna Corp , would mean higher