The liberal group Not One Penny is launching new billboards targeting GOP lawmakers and highlighting how they personally benefited from tax overhaul.

The campaign, shared first with Roll Call, includes figures from a recent report from the left-leaning Center for American progress on lawmakers’ own tax cuts under the GOP tax law. The billboards target 20 House members and 10 senators who have some of the highest tax cuts according to the report.

The billboards are will cost six-figures, though the group declined to give an exact amount. They are also part of a $5 million campaign, which has included television ads in Arizona and digital ads, to highlight the tax law after it was passed.

A sample billboard shows the image and name of a member of Congress, and says he voted for the tax law and got a tax break. “What did you get?” the billboard reads in orange letters.

“Congressional Republicans have given themselves massive tax breaks,” said Not One Penny Spokesperson Tim Hogan. “… Working families deserve better from their elected officials and will hold them accountable for voting to undermine the well-being of families across the nation.”

Republicans are expected to make the tax law a key campaign message in the midterm elections, arguing that the law led to bonuses and tax cuts for millions of Americans. Democrats will try to make the case that the tax law actually benefits the wealthiest Americans.

[Check out Roll Call’s 2018 Election Guide]

Of the 30 billboards, a handful are focused on Democratic targets in 2018. That includes Indiana GOP Rep. Trey Hollingsworth, who will receive more than $4.5 million in tax cuts under the new law, the highest the lawmakers highlighted in to the CAP report. Hollingsworth is the 12th wealthiest member of Congress with a net worth of more than $50 million, according to Roll Call’s Wealth of Congress project.

GOP Reps. David Valadao and Jeff Denham of California are also targeted in the new billboards, and both are Democratic targets in 2018. The CAP report states Valadao and Denham will respectively receive $1 million and $110,000 in tax cuts under the new law. Denham ranks 56th on the list of wealthy lawmakers. Valado though is the least wealthy lawmaker with a net worth of negative $17 million.

Dean Heller is the only GOP senator up for re-election targeted in the new billboards. The report claims the Nevada Republican will receive a nearly $5,000 tax cut. Heller ranks 124th on the Wealth of Congress list with a net worth of $2 million.

Watch: A Guide to Roll Call’s Wealth of Congress