"The CBO looked at a little piece of the issue, when we know the secretary of [the Department of Health and Human Services] will help bring market freedom and regulatory relief to the insurance markets to dramatically lower the price of the plan for the 50- and 60-year-olds," Ryan said.
"But even with that, we think we should be offering more assistance than what the bill currently does."
Health and Human Services Secretary Tom Price encouraged more legislative revision of the law.
"If it needs more beefing up ... for folks who are low income, between 50 and 64 years of age, that's something that we've talked about, something that we've entertained, and that may happen throughout the process," he said in an appearance on ABC's This Week.
Ryan added that he expects the House to make changes to Trump's proposed budget, which calls for increased military spending. He praised Congress for passing the Cures Act last year, calls for additional NIH money for "breakthrough discoveries on cancer and other diseases," and expects the proposed NIH cut will be revised.
"I would say, this is the very, very beginning of the budget process," he said. "We are encouraged that we're seeing an increase in defense because we think our military has been hollowed out. But I will say that NIH is something that's particularly popular in Congress. ... So, that is something that I think in Congress you'll see probably some changes."