Former U.S. Vice President Dick Cheney is recovering after undergoing heart transplant surgery Saturday.
Cheney's office said he is in the intensive-care unit at a Virginia hospital. He had been on a waiting list to receive a heart for 20 months.
His aide Kara Ahern said Cheney does not know the identity of the donor.
The 71-year-old Republican leader, who served as vice president in the George W. Bush administration, has had a long history of heart trouble.
Cheney has suffered five heart attacks since age 37, the latest in 2010. He had bypass surgery in 1988, as well as two subsequent angioplasties to clear narrowed coronary arteries. In 2001, he had a special pacemaker implanted in his chest.