The Supreme Court is to meet in private Friday with a high-profile issue on its agenda — President Donald Trump's birthright citizenship order, which dictates that children born to parents who are in the U.S. illegally or temporarily are not American citizens. The justices could announce on Monday whether they will hear Trump's appeal after lower courts have consistently ruled against the order, which has yet to take effect nationwide. If the court agrees to take up the case, it could hold oral arguments in the spring, with a ruling expected by early summer. Trump's order challenges over 125 years of constitutional interpretation that the 14th Amendment grants citizenship to those born in the U.S., with few exceptions. The administration is also appealing lower court decisions blocking its use of National Guard troops for immigration enforcement in Chicago.