WASHINGTON President Donald Trump s proposed budget for next year would cut Social Security Disability Insurance, despite Trumps vaunted campaign promise not to make any changes to Social Security.

A summary table indicates the Trump budget would cut disability insurance by $72 billion over 10 years, or about 4 percent of the programs projected cost.

Its my absolute intention to leave Social Security the way it is, Trump said during the presidential campaign , a promise he repeated several times.

Nancy Altman, president of Social Security Works, a nonprofit that advocates for expanding Social Security benefits across the board, said in a statement on Sunday that the budget amounts to a flagrant violation of Trumps campaign pledge.

The budget would make significantly larger cuts to Medicaid, which Trump also promised not to cut at various junctures on the campaign trail. Trump already broke that promise, however, by backing Republicans Obamacare repeal bill, which would cut over $800 billion from the program over a 10-year period.

Mick Mulvaney, the director of Trumps Office of Management and Budget, said that cutting disability insurance doesnt break Trumps campaign promise because most people think only of retirement insurance when they think of Social Security.

If you ask 999 people out of 1,000, [they] would tell you that Social Security disability is not part of Social Security, Mulvaney said on Monday. Its old-age retirement that they think of when they think of Social Security.

Mulvaney reiterated that defense at a press conference on Tuesday, claiming the president had only promised not to change Social Securitys retirement program.

Not a single thing in here touches Social Security retirement or Medicare, he said.

Social Security may be better known for retirement insurance, but its a little odd for a top government official to cite public misperception to argue that a program called Social Security Disability Insurance a program that is run by the Social Security Administration is not actually part of Social Security.

That is analogous to saying cuts to the Marines are not cuts to our military budget, Social Security Works president Nancy Altman said Monday.

Disability insurance is an essential component of the protections workers earn when they contribute to Social Security with every paycheck, Altman added. This budget is an utter betrayal of the voters who believed Trumps repeated promises.

More than 10 million Americans receive Social Security Disability Insurance. Monthly benefits average about $1,000. People become eligible for the program after working for years and suffering a debilitating medical condition or injury.

Although Republicans claim that the disability rolls are swollen with malingerers, only about 28 percent of people are awarded benefits when they first apply, and appeals can take years. The Social Security Administration inspector general testified to Congress in 2014 that the program has less than a 1 percent fraud rate.