Americans oppose the GOP tax plan by a 17-point margin, according to a new ABC News-Washington Post poll.

Half of Americans oppose the plan, a 6-point increase from September. Only 33 percent support it. Among Democrats, 79 percent oppose the plan, while 75 percent of Republicans support it.

The survey was conducted from Oct. 29 to Nov. 1 among 1,005 adults, just days before Republicans released the bill, meaning views of the tax plan could change.

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Sixty percent of those surveyed said the plan primarily favors the wealthy. President Trump has touted the plan as beneficial for the middle class, but many critics of the bill have said that the corporate tax cuts and phaseout of the estate tax will benefit the richest Americans.

Even the majority of wealthy Americans agree: Among respondents with incomes of $100,000 or more, 61 percent said the plan benefits the wealthy. And among the respondents who say it benefits the wealthy, only 10 percent say they support the plan.

House Republicans released their long-awaited legislation to overhaul the tax code on Thursday, proposing major cuts to corporate and individual tax rates.

The 429-page bill, called the Tax Cuts and Jobs Act, represents the opening salvo in the GOP's fight to rewrite the tax code for the first time in more than 30 years.