Democrats slammed the House Republican tax bill unveiled on Thursday for eliminating widely used deductions on state and local taxes, in particular calling out California members of the GOP caucus for supporting "a betrayal" of their constituents.

"While Republicans ambush the American people with this half-baked tax bill, written in the dark to be raced through Congress before it is understood, we already know some of what to be the truth," House Minority Leader Nancy Pelosi, D-Calif., said.

"It raises taxes on the middles class – millions of middle-class families across the country; – borrows trillions from the future – from our children and grandchildren's future to give tax cuts to the wealthiest – encourages corporations to ship jobs overseas, and the budget ransacks Medicare – a half a trillion dollars cut from Medicare and Medicaid. A trillion dollars cut from Medicaid."

The targets of her ire were the 14 Republican members of the California delegation – including Majority Leader Kevin McCarthy – who all voted last month to support a budget that opened the door to the $1.5 trillion tax reform plan rolled out Thursday.

Flanking Pelosi were more than a dozen other Democratic lawmakers from the Golden State. They listed the number of families who filed for the state and local deduction in each GOP-represented district in the state.

The deduction allows residents to exempt what they pay in state and local taxes from their federal taxable income. Nationally, 95 percent of nearly 45 million tax filers who itemized their deductions in the tax year 2015 filed for the state and local deduction, according to IRS data.

In California, Pelosi said, more than 6 million families use the deduction.

Cutting the deduction is likely to be one of the biggest roadblocks to the passage of the tax reform bill, as Republican members of the delegations from other wealthy states, namely New York and New Jersey, have already said they oppose it.

Thursday's gambit was meant to goad California lawmakers in joining them in pressuring House leaders to insist the deduction remain.

"We would hope that our colleagues would use their numbers – 14 – to influence the Republican leadership to take this out of the bill – and a bill that's a disaster in so many other respects as well," Pelosi said. "But short of that, we indict them for causing great harm to their constituents, financially, community-wise and to our great state."