Rumors to the contrary, Rep. Brian P. Bilbray of California says Republicans have no plans to force Democrats into voting on an immigration enforcement measure written by one of their own. Rep. Heath Shuler , D-N.C., has introduced legislation to strengthen border security and force employers to verify that their workers are legal (HR 4088). But the measure includes no provision to legalize millions of illegal immigrants, an idea that most Democrats say must be part of any immigration overhaul and that Republicans deride as “amnesty.” Consequently, Shuler’s bill is more popular with the GOP than with his own party – 90 of its 136 cosponsors, including Bilbray, are Republicans. Immigration lobbyists and interest groups suspect Republicans might try to force a vote on the bill by collecting signatures on a discharge petition.