And third, the bill lowers the value of cost-sharing subsidies for plans, so “most people purchasing it would have higher out-of-pocket spending on health care than under current law,” the budget office estimated.

He falsely said that people with pre-existing medical conditions will have “better” coverage than under Obamacare.

As under the current law, the Senate bill states that insurers cannot refuse coverage to people with pre-existing conditions, nor can they charge higher prices. But it allows states to apply for waivers to change essential health benefits, a set of services insurers now must provide.

So someone who needs certain drugs or treatments could not be denied or charged more for insurance, but their health plan may not cover those services if the state waived the rule. As a result, people may experience “substantial increases in supplemental premiums or out-of-pocket spending on health care, or would choose to forgo the services,” according to the budget office.

Of course, it is up to states what insurers would cover, but Mr. Trump’s claim that the plan is “better” than the current law for people with pre-existing conditions is unfounded.

He falsely said the bill will “provide better coverage for low-income Americans.”

The Affordable Care Act intended to expand Medicaid eligibility to 138 percent of poverty level from the previous threshold of 44 percent, and provide tax credits for those making between 100 percent and 400 percent of poverty. But the Supreme Court ruled in 2012 that the federal government could not compel states to expand their programs, and 19 states declined to do so. This created a gap in which people making between 44 and 100 percent of poverty neither qualified for Medicaid or subsidies in those states.

The Senate bill seeks to close that gap by expanding making tax credits available to people making between 0 and 350 percent of poverty. But because the benchmark plan under the Senate bill would pay only 58 percent of benefits, deductibles would increase. Therefore, “despite being eligible for premium tax credits, few low-income people would purchase any plan,” the budget office said.

The Senate bill also reduces funding to Medicaid — the health program for poor and disabled Americans — by more than $800 billion over the next decade, leading to 15 million fewer enrollees by 2026 than under the current law.