Pat Roberts is more conservative than Cruz or Mike Lee on immigration.
http://www.washingtontimes.com/news/2014/apr/28/sen-mike-lee-most-house-republicans-want-step-step/
Ive introduced one amendment to double the cap of legal immigration from 675,000 to 1.3 million. Another, to take the high-tech H1-B visas that are coming in and to increase them by 500%, from 65,000 to 325,000.