Opponents of the Republican plan to lower tax rates have started an ad campaign targeting vulnerable House members, depicting them as doing the bidding of rich donors.

The "Not One Penny" campaign, an effort backed by liberal groups that oppose President Trump, said Friday that it launched the ads as part of a seven-figure campaign aimed at generating opposition to tax cuts for high earners.

The campaign is backed by the Tax March, a group that organized after Trump's election to call on the president to release his tax returns, and by other left-leaning organizations.

Tailored ads will run in the districts of Republican Reps. Rod Blum of Iowa, David Young and Martha McSally of Arizona, Kevin Yoder of Kansas, Bruce Poliquin of Maine, Will Hurd of Texas, Rick Crawford of Arkansas, and Darrell Issa of California.

"Why are Republicans in Congress trying to pass a bill that would give billions more to the richest?" one version of the ad asks.

The ad mirrors Democratic leaders' conditions for going along with a GOP tax bill.

"We believe strongly that not one penny go to the top 1 percent and that any tax reform must be deficit neutral," Senate Minority Leader Chuck Schumer, D-N.Y., said this week.

On the pro-tax reform side, several outside groups, including the American Action Network and the Koch-affiliated Americans for Prosperity, have pledged to back legislation with major ad and advocacy campaigns.