The legislation is an attempt to head off any possible effort by the administration to subsidize the health plans of union members. Under current law, health plans at for-profit entities are eligible for subsidies, but union members' health plans are not.

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That is one of the reasons unions have been grumbling about the need to tweak the law in their favor. This week, the AFL-CIO approved a resolution calling for changes to the law, a vote that was preceded by an attempt by the Obama administration to quietly urge the group not to come out against the law.

Black's bill would prevent anyone who gets insurance coverage as part of a collective bargaining agreement from receiving health insurance subsidies under ObamaCare.

Her bill is the House companion to legislation that Sen. John ThuneJohn Randolph ThuneGOP divided over impeachment trial strategy Hillicon Valley: Twitter shares more details on political ad rules | Supreme Court takes up Google-Oracle fight | Pentagon chief defends Microsoft cloud contract House, Senate announce agreement on anti-robocall bill MORE (R-S.D.) introduced earlier in the week. When he introduced his proposal, Thune said the bill is designed to ensure that unions can't be granted a "backroom deal" to spare them the effects of the law that Democrats supported, and Republicans opposed.

Co-sponsors of Black's bill are Reps. Marsha BlackburnMarsha BlackburnTrump circuit court nominee in jeopardy amid GOP opposition Progressive freshmen jump into leadership PAC fundraising On The Money: US paid record .1B in tariffs in September | Dems ramp up oversight of 'opportunity zones' | Judge hints at letting House lawsuit over Trump tax returns proceed MORE (R-Tenn.), Rick CrawfordRichard (Rick) CrawfordThis week: House kicks off public phase of impeachment inquiry House Republicans add Jordan to Intel panel for impeachment probe Republican Congressman: DNI Nominee committed to declassification transparency MORE (R-Ark.), John Duncan Jr. (R-Tenn.), Chuck FleischmannCharles (Chuck) Joseph FleischmannTrump roasts Republicans at private fundraising event Trump faces new hit on deficit Lawmakers concede they might have to pass a dreaded 'CR' MORE (R-Tenn.), Tim GriffinJohn (Tim) Timothy GriffinFlynn discloses lobbying that may have helped Turkey Tea Party class reassesses record Huckabee's daughter to run '16 campaign MORE (R-Ark.) and Lynn Westmoreland (R-Ga.).

The bill is the latest legislative product from Republicans in the few short weeks left before the ObamaCare health insurance exchanges are scheduled to open on Oct. 1. Just this week, the House passed legislation from Black aimed at blocking subsidies for people to buy health insurance under these exchanges until a better eligibility system is established.