Sen. Edward Kennedy is undergoing further evaluation at a Boston hospital, two days after the 76-year-old Democrat suffered a seizure.

Kennedy's spokeswoman Stephanie Cutter says it is unclear when doctors will release information on Kennedy's condition or on the cause of his seizure Saturday.

Cutter said Monday the senator had a restful night at Massachusetts General Hospital. He spent Sunday watching sports and movies and visiting with family.

On the Scene: FOX News' Laura Ingle Blogs From the Hospital

President Bush had been notified of Kennedy's health just before he went to a Saturday night dinner meeting with Palestinian President Mahmoud Abbas.

A White House spokesman says Bush expressed concern for Kennedy and said he would keep him in his prayers. Bush has not spoken to the senator since he became ill.

Click here to read about the presidential candidates' reaction to Kennedy's hospitalization.