But just last month, in a letter to the Department of Justice, Aetna CEO Mark Bertolini said the two issues were closely linked. In fact, he made a clear threat: If President Barack Obama’s administration refused to allow the merger to proceed, he wrote, Aetna would be in worse financial position and would have to withdraw from most of its Obamacare markets, and quite likely all of them.

Bertolini penned the letter, which The Huffington Post obtained through a Freedom of Information Act request, on July 5 ― 16 days before the Justice Department announced it would fight the Humana deal. The department had asked Aetna how, if at all, a decision on the proposed merger would affect Aetna’s willingness to offer insurance through the exchanges.

Bertolini responded bluntly. Aetna supported the law’s goal to expand coverage and planned to increase its exchange offerings next year, in the hopes that the exchanges would stabilize as enrollment grew, he wrote.