The Trump administration does not intend to double-count the economic growth produced by tax reform, Treasury Secretary Steven Mnuchin said Thursday, amid criticism from Democrats over the math in the administration's budget.

Democrats expressed concern during a Thursday Senate Finance Committee hearing about the accounting in President Trump's budget, which estimates about $2 trillion in additional revenue from economic growth.

But the budget doesn't include details about tax reform, and Mnuchin has said in the past that economic growth would help pay for tax reform, raising questions over whether the administration was counting the $2 trillion in two different ways.

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"Unless you make this clear to us, aren't you double-counting the same $2 trillion to pay down deficits that you claim will pay for tax reform?" Senate Finance Committee ranking member Ron Wyden Ronald (Ron) Lee WydenGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high Republican Senators raise concerns over Oracle-TikTok deal Hillicon Valley: TikTok, Oracle seek Trump's approval as clock winds down | Hackers arrested for allegedly defacing U.S. websites after death of Iranian general | 400K people register to vote on Snapchat MORE (D-Ore.) asked.

"This is kind of Bernie Madoff math, but maybe I'm missing something."

Mnuchin said that the administration "absolutely" isn't planning to double-count economic growth.

"When the president's budget was done, we were not ready to have a full-blown tax reform plan that we could model into the budget, so we haven't put that in. We have put in the economic impact, as you've pointed out. There are other areas that are extremely conservative," he said.

"But I assure you when we present a tax plan, we will not be double-counting the growth."

Wyden appeared unsatisfied with Mnuchin's answer.

"We're told that sometime down the road, you won't double-count," he said. "I would sure like to see, as we've talked about, more specifics, because I don't see how your plan doesn't blow a multitrillion-dollar hole in the deficit."

Later in the hearing, Sen. Claire McCaskill Claire Conner McCaskillDemocratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally Missouri county issues travel advisory for Lake of the Ozarks after Memorial Day parties MORE (D-Mo.) also asked if the budget was double-counting revenues from economic growth, and Mnuchin answered similarly, saying economic growth isn't just coming from tax reform and is also coming from trade and regulatory policies.

"There's plenty of other things that will also impact the growth," he said.

McCaskill responded, "How can this document be taken seriously?"

Mnuchin said the budget was "completely transparent."

"Nobody's trying to hide anything," he said.