The Trump campaign said Tuesday that Aetna's decision to withdraw from many of Obamacare's marketplaces is evidence the law is "slowly imploding."

"Aetna's decision to leave the Affordable Care Act's public marketplaces is the latest blow to this broken law that is slowly imploding under its regulatory red tape," said Dan Kowalski, Trump's deputy national policy director.

Aetna announced Monday night that it will stop selling Obamacare plans in most states next year, becoming the latest of several major insurers who say they are losing too much money in the exchanges. If enough insurers leave the marketplaces, it could hurt competition among plans, driving up prices and limiting options for consumers.

Kowalski renewed Trump's promise that, as president, he would repeal President Obama's healthcare law.

"Mr. Trump has vowed to repeal and replace Obamacare," Kowalski said. "Affordable coverage for every American will be the top priority, and under a Trump presidency the government will work for the people again."