WICHITA, Kan. (AP) — Kansas Secretary of State Kris Kobach says Republican presidential candidate Donald Trump is correct on his immigration proposals.

Kobach was an adviser on immigration policy for 2012 GOP presidential nominee Mitt Romney, and says he had urged Romney to adopt the “self-deportation” concept in his campaign.

Under federal law, it is a crime to encourage or induce an illegal alien to remain in the United States. #RuleofLaw https://t.co/dZowjCE2sC

— Kris W. Kobach (@KrisKobach1787) August 5, 2015

Immigration enforcement is “a huge issue” for independents, and Kobach believes its focus in the primary will not hurt Republican chances in the general election.

He is not working now advising any of the presidential campaigns, but says he may do so in the future. He declined to specify which one.

But Kobach says other contenders in addition to Trump who have made statements on immigration enforcement in line with his own thinking are Texas Sen. Ted Cruz and Wisconsin Gov. Scott Walker.