Jan. 21 (UPI) -- Former U.S. Sen. Marco Rubio was sworn in as secretary of State on Tuesday morning and pledged to improve the department and make the country and world better over the next four years. Rubio was sworn by Vice President JD Vance in at 9:15 a.m. EST and briefly addressed State Department staff Tuesday afternoon. Advertisement "It's an honor to serve in this role," Rubio said. "Today is my first day on the job, but I am no stranger to it." Rubio thanked those who serve overseas