From NBC's Kelly O'Donnell and Ken Strickland
Sen. Robert Byrd was taken to the hospital this morning after he "apparently stood up too fast this morning in his home and fell down," senior Byrd aides tell NBC.
"To err on the side of caution, his caregiver called an ambulance. He was taken to the hospital where he is currently being checked out. At this point in time there is no indication that he will be admitted."
Byrd, the West Virginia Democrat, is the longest-serving senator in U.S. history. In his ninth term, he was elected to the Senate in 1958. He is 91.