President Donald Trump said on Wednesday the U.S. Constitution does not guarantee the right to citizenship to everyone born in the country, an assertion that runs counter to the long-established legal interpretation of the document.

"So-called Birthright Citizenship, which costs our Country billions of dollars and is very unfair to our citizens, will be ended one way or the other. It is not covered by the 14th Amendment because of the words 'subject to the jurisdiction thereof.' Many legal scholars agree....." Trump wrote in a Twitter post six days before U.S. congressional elections.

The Constitution's 14th Amendment, added after the Civil War, grants citizenship to anyone born on American soil and was intended to give constitutional protections to former slaves. But some Republicans, including Trump, say it creates an incentive for people to enter the country illegally to have children.