In 2016, Marco Rubio was a candidate for the Republican presidential nomination. His ballot status in the Arkansas Republican presidential primary was challenged by another candidate, David Librace, on the grounds that Rubio’s parents were never citizens of the United States, and therefore Rubio was not a “natural born citizen.” The case was Librace v Martin, e.d., 4:16cv-57.
The decision said that Librace did not have standing, and did not discuss the bigger issues in the case.
Rubio’s attorney, Jason Torchinsky, filed a brief in the case that argues that all persons born in the U.S., except for the children of foreign diplomats and the children of an invading army, are automatically citizens. This stance contradicts President Trump’s position on the matter. Currently Marco Rubio is the Secretary of State.