Trump made abolishing the Johnson Amendment a cornerstone of his campaign pitch to Christian conservative and evangelical voters. The president vowed at a National Prayer Breakfast in February that he would "totally destroy" the amendment.
Some campaign finance and tax policy experts said this week that altering or eliminating the Johnson Amendment could effectively make houses of worship and other nonprofits political operations.
"This, presumably, would encourage some people to give to churches in order to further their political interests and those contributions would be tax deductible," Gleckman said.
Maggie Garrett, legislative director for Americans United for the Separation of Church and State, said Brady's attempt to retool his original Johnson amendment modification is making matters worse.
"Allowing tax-exempt groups, whether religious or secular, to jump into partisan elections is a bad idea," Garrett said. "The way to fix this bad idea is by abandoning it, not expanding it."
House Democrats tried to kill Brady's initial Johnson Amendment rollback, quoting a Joint Committee on Taxation analysis that said repealing the amendment would cost the federal government about $2 billion over 10 years.
The loss of revenue would come from a shift of non-deductible contributions to political candidates and campaigns to deductible donations to houses of worship and other 501(c)(3) groups, Joint Committee on Taxation Chief of Staff Thomas Barthold told the Ways and Means Committee this week.
An amendment by Rep. John Lewis, D-Ga., in the Ways and Means Committee earlier this week to rebuff Brady's measure was defeated by a 16-23 vote.
Senate Republicans unveiled their tax plan this week and didn't include the House's Johnson Amendment language. Senators plan to write their own tax bill next week.
Supporters of modifying or abolishing the Johnson Amendment are talking to senators and have identified Sen. James Lankford, R-Okla., as a key ally.
Lankford and House Majority Whip Steve Scalise, R-La., introduced a bill in February that would amend the tax code and make it easier for nonprofit charitable organizations to make political comments. However, they would not be able to make contributions to candidates or campaigns under the bill.
Lankford said he hoped that language from his bill would work its way into the Senate GOP tax plan, adding that "we're working in that direction."
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