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 ThuneOvernight Tech: Senate panel subpoenaed ex-Yahoo chief | Twitter gives all users 280 characters | FBI can't access Texas shooter's phone | EU wants tax answers from Apple Overnight Cybersecurity: What we learned from Carter Page's House Intel testimony | House to mark up foreign intel reform law | FBI can't access Texas shooter's phone | Sessions to testify at hearing amid Russia scrutiny Former Yahoo CEO subpoenaed to appear before Congress 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's Twitter lockout raises safeguard concerns Anti-pyramid scheme legislation is necessary to protect consumers from fraud Former Tennessee rep enters race for Corker's Senate seat MORE (R-Tenn.), Rick CrawfordRichard (Rick) CrawfordLobbying World Progressive group running ads opposing tax cuts for the wealthy Lawmakers send well-wishes to Scalise on Twitter MORE (R-Ark.), John Duncan Jr. (R-Tenn.), Chuck FleischmannCharles (Chuck) Joseph FleischmannDivided GOP unites by attacking Hillary Clinton New whistleblower protections head to Trump's desk To support early childhood development, invest in housing MORE (R-Tenn.), Tim GriffinTim 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.