Conservative Republicans working to block a compromise immigration bill risk endorsing a "silent amnesty" by insisting on unfeasible mass deportations, U.S. Homeland Security Secretary Michael Chertoff said in an interview published on Thursday. In remarks to USA Today, Chertoff also criticized liberal immigrant rights advocates, saying they could prolong the anguish of immigrant families by withholding support for legislation that could give them legal status. Chertoff spoke to the newspaper's editorial board in a preview of a Bush administration media campaign to build support of broad immigration legislation being debated by the U.S. Senate, USA Today said. The compromise bill...