We are a nation of immigrants, but we are also a nation of laws. As a sovereign country, America has the right to control its border. I support the following rule: If you want to come to America, you have to be rigorously vetted to make sure you are not a terrorist, regardless of your religion or country of origin. If you can't be vetted, or you fail the vetting, you can't come. It would be stupid to let people who want to hurt us into our country. If you have been properly vetted, i.e., you have a legal immigration status such as a green card, you should be allowed in, as the White House clarified this weekend.