WASHINGTON — The House author of a border security bill that triggered massive street protests stood firm today against amnesty for illegal immigrants and predicted tough negotiations with the Senate on compromise legislation. The Senate passed its sweeping bill 62-36 Thursday after two weeks of debate and difficult votes that tested the strength of a coalition of bipartisan senators who supported the opportunity for U.S. citizenship that their bill would give most of the estimated 11 million to 12 million people who are in this country illegally.