Former New York City Mayor Rudolph Giuliani’s ongoing hospitalization is related to serious health repercussions of his heroism in New York City following the 9/11 terror attacks nearly 25 years ago, and the Republican stalwart’s condition appears to be improving, Fox News Digital has learned.

Giuliani was in the final year of his two-term mayorship when terrorists hijacked airliners and crashed them into the Twin Towers of the World Trade Center in Lower Manhattan, killing thousands. He was two blocks away when the first tower fell at 9:59 AM ET on that otherwise sunny Tuesday and felt the effects first-hand, close-up.

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Giuliani spokesman Ted Goodman told Fox News Digital on Monday that the 81-year-old ex-mayor and former presidential candidate is currently recovering from pneumonia and still being monitored at a Florida hospital as a “precautionary measure.”

“On September 11, Mayor Giuliani ran toward the towers to help those in need, which led to a restrictive airway disease diagnosis,” Goodman said in a statement he also later posted to X.

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“This disease adds complications to any emerging respiratory issue, and the virus quickly overwhelmed his body, requiring mechanical ventilation to maintain his blood pressure.”

Sometimes called “World Trade Center Cough,” restrictive airway disease is a lung condition caused by inhalation of heavily-alkaline dust from materials like concrete, as well as asbestos and glass that was pulverized when the towers collapsed and shrouded about one-fifth of Manhattan Island in some level of dust-induced darkness.

Thousands of first responders have battled or died from the disease, leading famous Tri-State figures like comedian Jon Stewart to publicly take up the mantle of their cause.

Goodman said Monday that Giuliani is now breathing on his own and has primary medical providers at his side.

“Mayor Giuliani is the ultimate fighter—as he has demonstrated throughout his life—and he is winning this battle,” he said.

“His family deeply appreciates the outpouring of love and support. The mayor believes in the power of prayer, and we are feeling that strength today. He remains in critical but stable condition. Keep the prayers coming.”

Former Vice President Kamala Harris endorsed Los Angeles Mayor Karen Bass for reelection on Monday.

“Mayor Karen Bass is the leader Los Angeles needs right now. She has done what so many said couldn’t be done — the first ever two-year decline in homelessness, reducing crime to levels this city hasn’t seen since the 1960s, and refusing to back down when the federal government came after our neighbors,” Harris said in a statement. “She has my full support for re-election.”

The endorsement comes as ballots have begun arriving in Californians’ mailboxes at a critical moment in the race to lead the nation’s second-largest city. Although Bass leads in polls, she is viewed unfavorably by many Angelenos for her perceived lack of leadership in the aftermath of the devastating Palisades fire.

A quarter of voters supported Bass in a March poll by the UC Berkeley Institute of Governmental Studies that was co-sponsored by The Times. City Councilmember Nithya Raman had the backing of 17%, and conservative reality TV star Spencer Pratt had 14%. A quarter of voters were undecided.

Though Bass led the other prominent mayoral candidates, political strategists say the numbers are troubling for the incumbent because she is facing off against lesser-known rivals and because 56% viewed her unfavorably. And Pratt and Raman had raised more money than Bass this year through April 18, according to fundraising disclosures filed with the city’s Ethics Commission. However, Bass had nearly $2.3 million in the bank because she started fundraising for reelection two years ago.

Though Bass and Harris were rivals to be selected as presidential nominee Joe Biden’s running mate in 2020, the two Democrats have known each other for more than two decades and have a long shared history. Bass was sworn in by Harris as the 43rd mayor of Los Angeles in 2022. Two years later, at the Democratic National Convention where Harris became the party’s presidential nominee, Bass spoke about working with her more than a decade ago on youth homelessness and fixing the child welfare system when Bass led the California Assembly and Harris was a state prosecutor.

Harris also endorsed Rob Bonta for reelection as state attorney general, Malia Cohen for reelection as state controller and Lt. Gov. Eleni Kounalakis for state treasurer. Here’s a look at those races and the rest on the ballot.