White House press secretary Sean Spicer said Wednesday it is “literally impossible” to predict the effects of the House Republican plan to repeal and replace ObamaCare.

“There are so many variables that are unknown,” Spicer told reporters. “It seems almost impossible.”

Spicer was pushing back on critics who accuse Republicans of moving too fast on a proposal that could reshape the U.S. healthcare system without knowing its true impact.

President Trump and his allies on Capitol Hill are rallying Republican support for the American Health Care Act (AHCA) with the hopes of holding a vote as soon as this week.

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But Democrats have voiced concern that lawmakers may vote on the plan without a score from the Congressional Budget Office (CBO) that would project the bill’s cost and influence on insurance rates.

A new change to the AHCA would provide $8 billion to help people with pre-existing conditions afford their premiums in states that receive a wavier from ObamaCare protections for those patients under the new bill.

But outside analyses have shown that the high-risk pools where those individuals would obtain insurance would be underfunded under the GOP plan.

The AARP called the proposal an “$8 billion giveaway to insurance companies” and said it “won't help majority of those w/preexisting conditions.”

The group's Public Policy Institute wrote last week, before the new funding proposal was released, that people with pre-existing conditions could pay as much as $25,700 per year in insurance premiums by 2019.

But Spicer claimed the GOP plan would actually “strengthen” coverage for those with pre-existing conditions by stabilizing the healthcare system as a whole.

“The president has made it very clear that pre-existing conditions are covered in the bill under every scenario, I don’t how much clearer we can state it,” he said.

He also disputed the accuracy of the AARP analysis.

“For someone to know how many people that is, what number of states are going to receive a waiver … is literally impossible at this point,” the spokesman said. “So to do an analysis of any level of factual basis would be literally impossible.”