"The Medicaid cuts being proposed by Republicans and Donald Trump are not only unconscionable but also represent a monumental lie to all of America - particularly Trump voters - who were told that Medicaid cuts would not happen if he was elected", he said in a statement.
White House Office of Management and Budget Director Mick Mulvaney on Thursday testified that the Trump administration does not believe $1.4 trillion worth of cuts it is proposing for Medicaid would affect children, the disabled or the elderly. Trump's budget summary says the program is fully paid for, but includes only $19 billion over the next decade.
The President wants legislators to cut at least $610bn (£471bn) from the Medicaid - a healthcare programme for the poor - and more than $192bn (£148bn) from the Supplemental Nutrition Assistance Program (Snap), the modern version of food stamps - as well as several other initiatives.
"This is the President of the United States turning his back on our nation's poor and daring them to survive on their own".
This is a budget created to reduce dependence on the government, as Budget Director Mick Mulvaney described the spending plans Tuesday.
Meantime, the most powerful Democrat in Washington - Senate Minority Leader Charles E. Schumer of NY - vowed to stand in the way of Trump's most draconian budget cuts. She said the Trump budget makes good on Republican promises to reign in federal spending.
"Republicans care about kids".
The White House has denied the president's budget proposal contains an "egregious" math error.
Instead of lifting them up with this budget, though, the Trump administration is going to drag the rest of the country down with them. The Environmental Protection Agency, the State Department, the Department of Housing and Urban Development, and the National Endowment for the Arts are among other agencies and programs that also would receive substantial cuts.
During the over three-hour hearing, Republican committee members praised the Trump budget for its vision to balance the budget within 10 years. "Grow the economy, balance the budget".
"Why? Because that's what the president said when he was campaigning, that he would not change those things", he said. But the Congressional Budget Office is projecting 1.9 percent growth, while the Fed projects 1.8 percent.
Mr Sanford said that the budget "assumes that the stars perfectly align" by promising an economic growth rate of 3 per cent but that such an economic surge wouldn't increase inflation. "If you are on food stamps, we need you to go to work".
The budget forecasts about US$ 2 trillion in extra federal revenue growth over the next 10 years, which it uses to pay for Mr. Trump's "biggest tax cut in history".
Under the president's proposed budget, Medicaid loses $610 billion over the next decade, which the administration suggests is on top of the $839 billion expected to be cut from Medicaid by the American Health Care Act.