How widespread are U.S. births by foreigners?

Some GOP presidential candidates have decried birthright citizenship and so-called “anchor babies” -- children born in the U.S. to parents in the country illegally. There’s also talk of “maternity tourism,” when foreigners arrive to give birth before returning home. Judy Woodruff learns more from Doris Meissner of the Migration Policy Institute and Susan Berfield of Bloomberg Businessweek.