WASHINGTON -- The American Action Network, a nonprofit that keeps its donors secret, is up with a new television and digital ad campaign supporting Rep. Tom MacArthur for supporting the Republican tax bill signed by President Donald Trump.

In all, AAN announced plans to spend $1 million on ads in 24 congressional districts after earlier spending $30 million to support the bill. American Action Network shares office space and staff with the Congressional Leadership Fund, a super political action committee with ties to House Speaker Paul Ryan, R-Wis.

"These tax cuts, wage increases, bonuses and other employee benefits - a direct result of the Tax Cuts and Jobs Act - are helping working families by providing a much-needed sense of financial security," said Cory Bliss, the group's executive director.

The ads thank MacArthur and the other members of Congress by name for "the middle-class tax cut."

While more than 80 percent of taxpayers initially will pay less, the richest 5 percent will get 43 percent of the benefits, according to the progressive Tax Policy Center. The bottom 80 percent will receive 36 percent.

Since the Republican bill makes the middle-class provisions temporary, the bottom 60 percent of taxpayers would see their taxes rise in 2027 while the richest 1 percent would get 83 percent of the benefits, according to the Tax Policy Center.

MacArthur, R-3rd Dist., was the only member of the New Jersey congressional delegation to vote for the bill, which also curbs the federal deduction for state and local taxes.

That's a tax break that disproportionately benefitted New Jersey and other high-tax states that already send billions of dollars more to Washington than they receive in services.

It has led officials in New Jersey and other states to look at ways to get around the $10,000 cap on state and local income, property and sales tax deductions.

The New Jersey state Senate has passed legislation allowing towns, counties and school districts to set up charitable funds that taxpayers can contribute to instead of paying property taxes, and then get an uncapped deduction for their charitable contribution on their federal income taxes.

MacArthur faces former National Security Adviser Andy Kim this fall. The Democratic Congressional Campaign Committee said the district is one of its best chances to win a Republican-held seat this fall.

Jonathan D. Salant may be reached at jsalant@njadvancemedia.com. Follow him on Twitter @JDSalant or on Facebook. Find NJ.com Politics on Facebook.