"It's a huge challenge for so many people," said Marianne Udow-Phillips.
"In Michigan, for example, about 90% of people who are enrolled in the marketplace get those tax credits," said Udow-Phillips. "For all of them, premiums are going up."
An analysis by the Kaiser Family Foundation in September estimated that out-of-pocket costs for ACA enrollees will more than double.
"A couple, let's say they earn $90,000 a year," said Udow-Phillips. "They go from paying $638 a month to $2,695 a month. They'd be paying almost $32,000 in health insurance premiums. Four times what they paid last year."