White House chief strategist Steve Bannon's plan to raise the top income-tax rate for America's highest earners could find some support among congressional Republicans as part of a populist message to sell a broader tax overhaul, according to one conservative lawmaker who has heard the proposal.

Bannon supports paying for middle-class tax cuts with a new top rate of 44 percent for those who make more than $5 million a year, according to a person familiar with his thinking. The lawmaker, who asked not to be named because discussions are private, said the rate pitched was 42 percent, which would be acceptable to some conservatives, as long as it's coupled with a low corporate rate and other changes like repealing the alternative minimum tax. The current top individual rate is 39.6 percent.

The proposal could give President Donald Trump's administration momentum to drum up popular support to rewrite the tax code, while wealthy individuals would get other tax benefits, such as the repeal of the estate tax, to partially offset the higher rate.