Sadly, this news isn't surprising in the slightest. From the Huffington Post:
The Republican plan to repeal and “replace” the Affordable Care Act would increase the number of Americans without health coverage by 24 million and reduce the federal budget deficit by $337 billion by 2026, according to a Congressional Budget Office report published Monday.
These negative findings give lie to Trump’s repeated promises that the Republican alternative would provide universal coverage and lower prices for Americans. Shortly before taking office, for example, Trump told The Washington Post that “we’re going to have insurance for everybody” that would be “much less expensive and much better.”
Of course Republicans aren't the least bit concerned about the numbers of people who will go without health care -- all that matters is the savings the government stands to make from booting people off their insurance.
But fear not, concerned citizens, according to the Trump administration, the CBO isn't to be trusted because, you know, alternate facts and all that. "If you're looking to the CBO for accuracy, you're looking in the wrong place,” Sean Spicer said last week, anticipating the office trashing their newly minted plan. Instead we'll have to go with Trump's word on this. It'll be "tremendous" apparently, so there's nothing to worry about.
You can read the full CBO report here.