Hospitalized former New York City Mayor Rudy Giuliani, 81, has come down with pneumonia, a business partner has revealed. 

The top Trump ally was hospitalized in critical condition in Florida on Sunday, and the President praised him on Truth Social as a 'True Warrior.'

'Rudy had a tough weekend. He had pneumonia,' Giuliani's business partner Tom von Essen told the New York Post on Monday.

Von Essen worked as the New York City Fire Commissioner during the 9/11 terrorist attacks when Giuliani was mayor. 

'Today is an important day,' he added. 

Giuliani's spokesman, Ted Goodman, confirmed in a statement Monday that the mayor is recovering from pneumonia. 

'Mayor Rudy Giuliani is recovering from pneumonia. On September 11th, Mayor Giuliani ran toward the towers to help those in need, which later led to a diagnosis of restrictive airway disease.'

'This condition adds complications to any respiratory illness, and the virus quickly overwhelmed his body, requiring mechanical ventilation to maintain adequate oxygen and stabilize his condition.'

Goodman continued: 'He is now breathing on his own, with his family and primary medical provider at his side. He remains in critical but stable condition. Please keep the prayers coming.'

The 81-year-old held a livestream on his Facebook page on Friday night during which he could be heard coughing.

As it started, he said: 'My voice is a little under the weather, so I won't be able to speak as loudly as I usually do.'

President Trump called Giuliani a 'True Warrior' in a post on Truth Social Sunday evening, claiming he was 'the best mayor in the history of New York City, by far.'

'What a tragedy that he was treated so badly by the Radical Left Lunatics, Democrats all - and he was right about everything! They cheated on the Elections, fabricated hundreds of stories, did anything possible to destroy our Nation, and now, look at Rudy. So sad!' 

Giuliani famously campaigned with Trump and a group of Republicans to overturn the 2020 election results, citing unverified fraud that later opened him up to defamation suits he settled in court.

'Mayor Rudy Giuliani was the most transformative figure in the history of NY City politics,' Former Deputy FBI Director Dan Bongino wrote. 

'He pulled off an economic and public safety miracle in a relatively short amount of time, and the city rose from the dead. I worked for the NYPD during the end of his second term. It was the honor of a lifetime.'

Giuliani mostly recently chimed in on remarks made by comedian Jimmy Kimmel prior to the shooting at the White House Correspondents' dinner.

Kimmel joked that the First Lady Melania Trump had a ‘glow like an expectant widow,' which sparked fury from the First Lady and the White House after the shooting.

Giuliani also gave his two cents, calling Kimmel an ‘incompetent jackass,' to which Kimmel responded, saying Giuliani ‘rose from the grave to weigh in on the ongoing drama.'

In November of last year Giuliani was pardoned by Trump, among other Republicans, for his role in trying to overturn the election against President Biden.

The former NYC mayor gave an infamous speech outside the Four Seasons landscaping business in Pennsylvania as Trump desperately attempted to claw back the presidency.

In 2023, Giuliani filed for bankruptcy with staggering debts of $153 million owed to creditors, including two Georgia election workers he defamed.

Giuliani was elected New York’s mayor in 1993 after serving as one of the nation’s highest-profile prosecutors, taking on mobsters and crooked Wall Street traders. 

He was celebrated for a widespread crackdown on crime using the 'broken windows' philosophy and implementing the controversial stop-and-frisk program.

Giuliani ran for the U.S. Senate in 2000 but abandoned his race against Hillary Clinton after being diagnosed with prostate cancer.

He ran for US President in 2008 before dropping out and backing John McCain.