White House budget chief Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE said there is "no chance" Democrats will support a tax reform plan that lowers the corporate tax rate.

"I've asked a couple Democrats if they'd ever vote to lower the corporate tax rate and they told me no," Mulvaney said on "Fox News Sunday."

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"Which is really just bizarre ... since they supported themselves bills in the past — in fact some Democrats supported bills ... that actually lowered the corporate tax rate," he continued.

"It's almost as if, since it's President Trump's administration and it's a Republican plan, now they're against it," he said.

Mulvaney also said people need to learn the "entire impact" of Trump's tax plan in order to decide whether to support it.

Senate Republicans took the first step last week toward passing a tax plan and fulfilling a long-held campaign pledge.

Senators narrowly voted, 51-49, to pass the fiscal 2018 budget after a grueling hours-long marathon on the Senate floor. Sen. Rand Paul (R-Ky.) joined with every Democrat and independent to vote against the bill.

The spending blueprint is key to Republicans' efforts to pass tax reform, because it includes instructions that will allow the plan to avoid a Democratic filibuster.