NEW YORK (AP) — Former New York City Mayor Rudy Giuliani is hospitalized in critical but stable condition, his spokesperson said Sunday, days after the Republican hoarsely told his talk show audience that his voice was “a little under the weather.”

The spokesperson, Ted Goodman, didn’t say what sent Giuliani, 81, to the hospital, how long he’s been there or what his prognosis is.

“Mayor Giuliani is a fighter who has faced every challenge in his life with unwavering strength, and he’s fighting with that same level of strength as we speak,” Goodman said in a statement. He said that Giuliani “remains in critical but stable condition.”

Giuliani’s eight-year tenure as the mayor of the nation’s largest city was punctuated by the 9/11 attack in his final months in office, and he became celebrated as “America’s mayor” for his leadership after the 2001 al-Qaida terrorist attack that felled the World Trade Center twin towers.

Giuliani later made an unsuccessful run for president and was an adviser to President Donald Trump, spearheading his efforts to stay in office after his 2020 election loss.