The US Congressional Budget Office (CBO) report on a Republican health care bill has set off an intense reaction in Washington, and some on both sides of the debate are playing loose with the facts.
Republicans are overlooking President Donald Trump's promise to deliver "insurance for everybody", which the CBO makes clear will not happen if the legislation becomes law.
Democrats are hitting out at Republicans for "attacking the messenger", seeming to forget all the times they attacked the budget office themselves.
The CBO is respected for non-partisan rigour in its estimates of the costs and impacts of legislation.
However, no projection is infallible, particularly when it comes to large, complex programmes. For example, the agency in 2010 overstated the number of people expected to buy insurance under President Barack Obama's health care law, misjudging how many would join because of the threat of tax penalties.
Yet, CBO's neutrality has been valued by both parties - although not always at the same time.
Here is a look at statements in the debate and how they compare with the CBO's estimates and the underlying facts:
:: Mr Trump: "We're going to have insurance for everybody. There was a philosophy in some circles that if you can't pay for it, you don't get it. That's not going to happen with us." - To The Washington Post on January 15.
CBO: It estimates the bill would leave 14 million fewer people insured in the first year, 24 million fewer by 2026.
In the first year, the biggest reason more people are uninsured would be repeal of penalties Barack Obama's law imposes on those deemed able to afford insurance but who do not buy it.
Still others would decide to forgo coverage because of higher premiums or do without Medicaid. In following years the main reason for a drop in the number of insured would be that the Republican bill scales back Medicaid for low-income Americans.
Altogether, the CBO estimates 52 million people would be uninsured by 2026, a vast distance from "insurance for everybody".
:: Chuck Schumer, Senate Democratic leader: "CBO is virtually unassailable. Everyone, Democrats and Republicans, whether it be George Bush, Barack Obama or anyone else has gone along with CBO. CBO speaks the truth. They've been speaking the truth for decades and to try to attack CBO is simply attacking the messenger." - Comments to reporters on Tuesday.
Nancy Pelosi, House Democratic leader, on the Republican reaction to the CBO: "Some of them are trying to pin a rose on this report and make it sound like it's a good thing and the others of them are trying to discredit the CBO, but it's completely wrong, completely wrong... numbers are quite elegant things, you know. They speak very clearly." - Comments to reporters on Tuesday.
The facts: Democrats have not hesitated to attack this messenger when its conclusions have not suited them.
"The Congressional Budget Office never gives us any credit," President Obama said in 2009 when the CBO pointed to the expense of Democratic health overhaul proposals.
Ms Pelosi complained at the time: "The CBO will always give you the worst-case scenario."
Again in 2014, she did not consider the CBO's numbers "elegant", or correct, when they forecast job losses from a Democratic effort to raise the minimum wage.
She accused the CBO of making arguments that "contradict the consensus among hundreds of America's top economists" and said it "ignored new perspectives in the wide array of analysis on the minimum wage".
:: Mr Trump: People covered under the law "can expect to have great health care. It will be in a much simplified form. Much less expensive and much better... lower numbers, much lower deductibles".
CBO: It says cost-sharing payments in the individual market, including deductibles, "would tend to be higher than those anticipated under current law".
Cost-sharing subsidies would be repealed in 2020, "significantly increasing out-of-pocket costs for nongroup (private) insurance for many lower-income enrollees".
:: Mr Trump at a Cabinet meeting on Monday: "Obamacare, all of a sudden, the last couple of weeks, is getting a false rep that maybe it's okay. It's not okay, it's a disaster and people understand that it's failed and it's imploding. And if we let it go for another year, it'll totally implode."
CBO: Not in the view of the budget experts. They described the market for individual policies under Mr Obama's health care law as "stable".
They said it is likely to remain stable under the proposed GOP replacement legislation, too.
:: Mick Mulvaney, Mr Trump's budget director: "If you have coverage that doesn't allow you to go to the doctor, what good is it in the first place? Democrats took all of this credit for giving people coverage, but ignored the fact that they had created this large group of people that still could not go to the doctor." - On MSNBC's Morning Joe on Tuesday.
The facts: Republicans gloss over reality when they make this argument.
While deductibles are high for the Affordable Care Act's (ACA) private insurance plans (averaging $3,000 last year for a standard silver plan), the law requires preventive care to be covered at no charge.
And more than half of the people enrolled in the health law's insurance markets get an extra subsidy when they go to seek care.
It can reduce a deductible from several thousand dollars to a few hundred. The GOP bill would repeal those subsidies.
Other evidence points to tangible benefits from Mr Obama's coverage expansion.
For example, government researchers have found fewer Americans struggling to pay medical bills. A 2015 report found that problems with medical bills had declined for the fourth year in a row.
Most of the improvement was among low-income people and those with government coverage, and it coincided with the ACA's big coverage expansion.
:: Tom Price, health and human services secretary: "I firmly believe that nobody will be worse off financially in the process that we're going through." - On NBC's Meet The Press on Sunday.
CBO: There are losers as well as winners, the analysts found.
Generally, older people are bound to face higher costs because the legislation would let insurance companies charge them up to five times more for premiums than they charge young people. They can only be charged three times more now.
The bottom line, the analysts say, would be "substantially reducing premiums for young adults and substantially raising premiums for older people".
:: Mr Mulvaney: "Actually I don't think the costs will go up at all." - On ABC's This Week on Sunday.
CBO: It estimates that some costs indeed will go up, at least for a few years.
The analysts say average premiums in the private insurance market would rise in 2018 and 2019 by 15% to 20%, compared with current law, then start to come down.
By 2026, average premiums could be 10% lower, compared with the existing law.
One reason is that insurers could eliminate a current requirement to offer plans that cover a set percentage of the cost of certain benefits.