Bill O'Reilly grilled Republican presidential candidate Marco Rubio on what his policy will be on illegal immigration and immigration in general. The candidate appeared on Monday's broadcast of FOX News Channel's The O'Reilly Factor. Rubio said his immigration plan, once the U.S.-Mexico border is secure, "depends on what the American people will support." Rubio says once "we prove to the American people" that illegal immigration is under control, he believes Americans will respond in a "very rational, reasonable and responsible way."