Story highlights Spicer said the CBO is "consistently wrong"

"The President's goal is to make insurance available for everybody," Spicer said

Washington (CNN) The White House cautioned Republican lawmakers Tuesday against abandoning their own party's health care plan, warning skeptics that the measure presents the best -- and, potentially, only -- chance to repeal Obamacare.

"This is the only vehicle that seeks to achieve what people on our side have been talking about since 2010. This is it," White House press secretary Sean Spicer told reporters at the White House, a day after the nonpartisan Congressional Budget Office released an analysis showing the Republican plan could result in 24 million fewer insured Americans by 2026

Calling the CBO "consistently wrong" on projecting health coverage, Spicer insisted that scuttling the bill up for debate -- called the American Health Care Act -- could end Republicans' dreams of ridding the country of the current health law.

"If we don't get this through, the goal of repealing Obamacare and instituting a system that will be patient centered is going to be unbelievably difficult," Spicer said. "This is the vehicle to do that."

His remarks came as Republican support for the health bill appeared to be fracturing . Moderates fear they'll come under political fire for supporting a plan that's estimated to reduce the number of insured, while conservatives are using the CBO report to argue for more changes to the proposal.

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