http://www.politicspa.com/pa-11-barletta-endorses-santorums-presidential-campaign/66811/
...Both Barletta* and Santorum have made pro-worker immigration policies one of their top priorities. Santorum is also the only 2016 Republican presidential candidate that has received an “A” rating from NumbersUSA**.

“I am honored to receive Congressman Barletta’s endorsement today...

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*http://www.pfaw.org/rww-in-focus/the-ten-scariest-republicans-heading-to-congress#barletta

...Barletta rose to national prominence as the mayor of Hazleton, Pennsylvania, a small working class city that in 2006 enacted some of the most draconian anti-immigrant measures in the country...

...A federal judge struck down Barletta's law in 2007, writing, "The genius of our Constitution is that it provides rights even to those who evoke the least sympathy from the general public. Hazleton, in its zeal to control the presence of a group deemed undesirable, violated the rights of such people, as well as others within the community." An appeals court this year upheld the ruling...

**http://en.wikipedia.org/wiki/NumbersUSA
The Southern Poverty Law Center (SPLC) describes NumbersUSA as part of a network of "anti-immigration" organizations