Former New York City mayor Rudy Giuliani has been hospitalized in critical but stable condition, according to a statement released by his spokesperson on Sunday night. The statement did not disclose the cause of his hospitalization.

Giuliani, 81, is a close ally of President Donald Trump and has remained a prominent political figure in recent years. His spokesperson described him as a fighter facing this challenge with strength and asked the public to keep him in their prayers.

Further details about his condition have not been released, and the situation remains developing.