Beau Biden, the son of Vice President Joe Biden, was admitted to hospital on Monday after experiencing "disorientation and weakness" while on vacation.
"This morning, the vice president accompanied his son Beau Biden to Houston, Texas, where Beau is being evaluated to determine the cause of an episode of disorientation and weakness that he experienced while on vacation with his family last week," the White House said in a statement late Monday.
The younger Biden, 44, who is Delaware's attorney general and who also served in Iraq as a captain in the Delaware National Guard, suffered a minor stroke in 2010.
Biden was admitted to Northwestern Memorial Hospital in Chicago last week after feeling weak following a drive to Indiana for a family vacation, the New York Times
He later traveled to Jefferson University Hospital in Philadelphia to consult with his doctor.