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 ThuneTurkey sanctions face possible wall in GOP Senate GOP cautions Graham against hauling Biden before Senate War of words at the White House 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 BlackburnGraham, Van Hollen introduce Turkey sanctions bill Lawmakers toast Greta Van Susteren's new show GOP senators say Erdo─čan White House invitation should be revoked MORE (R-Tenn.), Rick CrawfordRichard (Rick) CrawfordRepublican Congressman: DNI Nominee committed to declassification transparency The Hill's Morning Report - Attacked repeatedly, Biden fires back Politicians cheer USWNT over defeating England, qualifying for World Cup final MORE (R-Ark.), John Duncan Jr. (R-Tenn.), Chuck FleischmannCharles (Chuck) Joseph FleischmannTrump faces new hit on deficit Lawmakers concede they might have to pass a dreaded 'CR' GOP blasts Democrats for using 2014 'kids in cages' photo to promote migrant hearing 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.