I support expanding legal immigration. I believe in welcoming refugees. I think deporting 11 million illegal immigrants is cruel and impractical, some form of amnesty is inevitable, and Donald Trump's wall on the border with Mexico would be a $25 billion boondoggle.

I also believe that the United States needs to pass a constitutional amendment making it impossible for anyone living in the country illegally after that point to acquire legal permanent residency or citizenship, including for their children born here.

As part of a package of comprehensive immigration reforms, such an amendment could both curb illegal immigration and help heal one of the biggest partisan rifts facing the country. It would remove a huge incentive for illegal immigration. It would reinforce the importance of citizenship, bolster public support for legal immigration and honor the 4.5 million would-be immigrants waiting patiently for their green cards. And it would affirm that we are a nation of laws, not loopholes — surely one reason many immigrants are attracted to the U.S. in the first place.