Insurers will again be able to sell short-term health insurance good for up to 12 months under a proposed rule released Tuesday by the Trump administration that could further roil the marketplace.

"We want to open up affordable alternatives to unaffordable Affordable Care Act policies," said Health and Human Sservices Secretary Alex Azar. "This is one step in the direction of providing Americans health insurance options that are more affordable and more suitable to individual and family circumstances."

The directive follows an executive order issued in October to roll back restrictions put in place during the Obama administration that limited these plans to three months. The rule comes on the heels of Congress' approval of tax legislation that in 2019 will end the penalty for people who opt not to carry insurance coverage.