Santorum is the other one beside Trump who has expressly said they want to reduce legal immigration.
April 20, 2015 - Breitbart: Scott Walker Lays Out Pro American Worker Stance on Immigration “During an interview with Glenn Beck, Walker became the first declared or potential 2016 GOP presidential candidate to stake out a position on immigration fully in line with that of Senate Judiciary Committee subcommittee on Immigration and the National Interest chairman Sen. Jeff Sessions (R-AL). He also noted that he has been working with Chairman Sessions on the issue to learn more about it.
Walker is now the only potential or declared GOP presidential candidate to discuss the negative effects of a massive increase in legal immigration on American workers:...........................”