Aetna is hitting back at allegations that its decision to withdraw from a number of Affordable Care Act state exchanges was politically motivated.

The insurer's move to leave all but a few state marketplaces was just business, so says CEO Mark Bertolini in a letter to a group of senators Tuesday.

His letter was a response to one authored by five Democrats, including Elizabeth Warren and former presidential candidate Bernie Sanders, who accused the company of abandoning its Obamacare customers as retaliation for the Obama administration's attempt to block its merger with Humana.

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