The executive order restricts automatic citizenship for babies born to parents who aren't citizens or lawful, permanent residents.

Attorney General Rob Bonta said he would defend birthright citizenship following an executive order by President Donald Trump, as California officials gear up for what is expected to be many legal challenges involving the new administration.

California sued Trump's first administration 123 times. Trump lost two-thirds of those cases, but experts warn that California could have a tougher go this time.