The House of Representatives is set to vote on this on Wednesday this week. So far it has 18 cosponsors. The bill is proposed in response to the NLRB’s Boeing complaint.
Link to bill: http://www.govtrack.us/congress/bill.xpd?bill=h112-2587
To prohibit the National Labor Relations Board from ordering any employer to close, relocate, or transfer employment under any circumstance.
Bill text can be read here: http://www.govtrack.us/congress/billtext.xpd?bill=h112-2587