"Moreno, who was born in Bogota, Colombia, and moved to the U.S. at 5 years old, said in a statement last month allowing U.S. citizens to maintain foreign citizenship would create a conflict of interest. “One of the greatest honors of my life was when I became an American citizen at 18, the first opportunity I could do so,” Moreno said. “It was an honor to pledge an Oath of Allegiance to the United States of America and ONLY to the United States of America! Being an American citizen is an honor and a privilege—and if you want to be an American, it’s all or nothing." Currently, the law allows U.S. citizens to hold multiple foreign citizenships in addition to their U.S. citizenship, according to the Department of State. Several countries offer citizenship by investment or citizenship by descent, allowing people to apply for a second passport if a grandparent or even great-grandparent held citizenship. And some countries are easier to become citizens of than others: Portugal and Italy, for example, are notably easier than some other nations. However, the State Department said U.S. travelers who hold two passports must enter and leave the U.S. with their U.S. passport. The department also noted some countries may not permit dual nationality and may not recognize a traveler's U.S. nationality when they are abroad."