From Rick Santorum Website, immigration section (thought it might be good to compare the two positions):
http://www.ricksantorum.com/immigration_reform
Rick Santorum Immigration Plan
Over the past twenty years, nearly 35 million legal and illegal immigrants have come to our shores. This is the largest mass immigration America has seen in our history – even surpassing the Great Wave from the turn of the 20th Century. These immigrants are largely unskilled and low-skilled labor and they are competing for the same jobs as the 74% of Americans who do not have a college degree.
Every net new job created since 2000 for people between 18 and 65 is held by someone who wasn’t born in this country. This needs to change.
The American family is the first economy. Just like a business, each family needs revenue, pays expenses, and at the end of the month the books must balance.
As families struggle in this ever competitive labor market, we must make sure our policies do not throw up further roadblocks and dead ends to their ability to succeed. We must rebuild this first economy, and one step is to ensure we have a responsible immigration policy that puts the American worker and their families first.
We must reduce immigration levels to the United States in order to protect American workers from foreign labor that is taking jobs that Americans could otherwise hold.
Key Actions:
Enforce the law by implementing a biometric tracking system for every immigrant who enters America so we can track who is here and who has overstayed their visa. Anyone apprehended who has overstayed their visa should be subject to fines and then subsequently removed.
End the practice of sanctuary cities by withholding federal funds from any city that refuses to cooperate with federal authorities.
Put an end to president Obama’s unconstitutional executive amnesty which is largely responsible for the latest border surge.
Push for congressional action to require all businesses use e-verify for all employees to assure those who play by the rules are rewarded and employers who hire illegal immigrants are held accountable.
Join every other developed country in the world save one, and put an end to automatic citizenship for children born here to illegal immigrants.
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I don't know, it really looks like Trump put more thought and effort into his position paper and has more key actions. Plus the deportation of illegal aliens within 2 years which is huge. That removes the "base", that ends the chain migration, that ends the lure, aiding, abetting, harboring, and so forth which they do for each other.