Secretary of State Marco Rubio was visiting Guyana amid ExxonMobil’s oil production there. Venezuela has asserted claims to a large region of the country. Mr. Rubio later flew to Suriname.

U.S. Secretary of State Marco Rubio has vowed that the United States will respond forcefully if Venezuela attacks Guyana amid an ongoing territorial dispute that involves massive oil and gas reserves.

U.S. Secretary of State Marco Rubio warned Venezuela against attacking Guyana, prompting a sharp reaction from Nicolás Maduro, who asserted that no one can threaten Venezuela. What you need to know Marco Rubio,