Rep. Ted Lieu (D-Calif.) slammed President Trump’s newly-unveiled budget proposal on Tuesday, saying that Trump’s budget is evidence to voters that “he lied.”

“To many voters who supported Trump, the [Trump budget] is further proof he lied to you,” Lieu tweeted. “You can believe in MATH or you can believe in the [Trump budget]. You cannot do both.”

To many of the voters who supported Trump, the #Trumpbudget is further proof he lied to you. https://t.co/pggCL2jpv9 — Ted Lieu (@tedlieu) May 23, 2017

You can believe in MATH or you can believe in the #TrumpBudget. You cannot do both. https://t.co/6FKICCd39y — Ted Lieu (@tedlieu) May 23, 2017

Lieu referenced an accounting error in Trump’s budget that former Treasury Secretary Larry Summer called “egregious” in a Washington Post op-ed.

Summer noted in the op-ed that the budget seems to double-count the economic benefits from a massive tax reform package that the GOP has not completed but which the budget assumes will be revenue-neutral.

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But the budget also assumes high level of economic growth outside of the tax reform and also counts those revenue benefits towards its totals.

“This is a mistake no serious business person would make. It appears to be the most egregious accounting error in a presidential budget in the nearly 40 years I have been tracking them,” Summer wrote.

Treasury Secretary Steve Mnuchin dismissed the claims because the tax reform package is still being worked on.

"We felt it was premature to put any changes in the budget from taxes since we're not far enough along to estimate what that plan will be,” Mnuchin said at the Peterson Foundation Fiscal Summit.

Trump’s budget plan has been pilloried by politicians on both sides of the aisle since its unveiling on Tuesday. Sen. Lindsey Graham Lindsey Olin GrahamThe Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Senate Democrats' campaign arm announces seven-figure investment to boost Graham challenger Graham: Comey to testify about FBI's Russia probe, Mueller declined invitation MORE (R-S.C.) joined a host of GOP lawmakers criticizing the plan, calling the proposal “terrible.” Meanwhile, Congressional Democrats are hitting the plan’s many cuts to programs that benefit low- and middle-income families.

“President Trump made a lot of promises to families across the country that supported him. This budget turns his back on all of the promises,” Rep. Ben Ray Luján (D-N.M.) said.