Rand Paul is on the “repeal birthright citizenship train”
washingtonpost.com

More at the link (article from 2015):

In his ongoing war with Donald Trump, Sen. Rand Paul (R-Ky.) has portrayed the tycoon-cum-candidate as a chameleon, a late-comer to conservative policies that Tea Party activists (like Paul) advocated for years. Among those policies: Changing interpretation of the 14th Amendment to prevent “birthright citizenship.” In 2011, just days into his Senate career, Paul joined Sen. David Vitter (R-La.) on a resolution which would have clarified “that under the 14th Amendment a person born in the United States to illegal aliens does not automatically gain citizenship.” Just three months into his Senate career, Vitter, Paul, and Sen. Mike Lee (R-Utah) wrote new legislative language on this.

That went nowhere, but Paul has not changed his mind. During an interview in Haiti this week, he said that the current reading of the 14th Amendment was problematic as long as it inspired undocumented immigrants to come to the United States and give birth.