Conservative groups backed by billionaire GOP donors Charles and David Koch are concerned the new GOP bill might include a provision that would amount to a consumer tax. More specifically, they're worried that the blueprint to be released Thursday could include something similar to the "border adjustment" proposal to tax imports and exempt exports that died earlier this year.

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The proposal drew significant opposition from GOP lawmakers, business groups and conservative groups, and was set aside in July.

“We haven’t seen the legislation, but any new consumer tax hike would be extremely concerning and potentially undermine the fundamental promise that tax reform would mean tax relief," said James Davis, Freedom Partners Chamber of Commerce executive vice president.

It's not entirely clear, however, that the conservative groups have anything to worry about.

It's a form of global minimum tax on high-profit foreign subsidiaries. Doesn't look BAT-like to me. wait for text.https://t.co/QMq9GAYN6G https://t.co/fDef4eYEqY — Richard Rubin (@RichardRubinDC) November 2, 2017

Separately, the National Retail Federation also discounted the possibility.