Liberal journalist Michael Wolff gained prominence in 2018 with his book "Fire and Fury," which offered an unflattering account of then-President Donald Trump's administration.

This month saw Wolff release another book called, "The Fall: The End of Fox News and the Murdoch Dynasty." In it, Wolff asserts that Fox News founder Rupert Murdoch hopes for the former president's death.

"How could he still be alive?"

That's according to an article published by The Guardian last week about Wolff's latest work, which quoted the author as saying Murdoch is "a frothing-at-the-mouth" critic of Trump.

"Of all Trump’s implacable enemies, Murdoch had become a frothing-at-the-mouth one," Wolff said of the broadcast tycoon.

"His relatively calm demeanor from the early Trump presidency where, with a sigh, he could dismiss him merely as a 'fucking idiot' had now become a churning stew of rage and recrimination," the author continued.

Wolff wrote that the 92-year-old media mogul often laments the facts that Trump hasn't passed away yet and regularly makes statements like "This would all be solved if …" or "How could he still be alive, how could he?"

Trump and Murdoch once had a symbiotic relationship

The author pointed out how Trump and Murdoch's Fox News once enjoyed a mutually beneficial relationship with one another.

However, Murdoch is said to have begun growing sour on Trump towards the end of his term, culminating on election night in 2020.

Heated moment on Fox News over Arizona call: pic.twitter.com/X0yIy18H9O

— The Recount (@therecount) November 4, 2020

Murdoch personally endorsed his network's decision to call Arizona for President Joe Biden relatively early in the evening, a move which infuriated Trump as well as those who supported him.

Former president proved more resilient than Murdoch expected

Wolff explained that Murdoch "like much of the Republican establishment … had convinced himself that Trump was, finally, vulnerable."

"That his hold on the base and on Republican politicians had weakened enough that now was the time to kill him off, finally," the author added.

Yet that assessment has proven to be spectacularly flawed, as most surveys show Trump to be the Republican Party's front running while other polls have him ahead of Joe Biden.

The Guardian quotes Wolff as saying that his source material consists of "conversations specifically for this book, and other conversations that have taken place over many years … scenes and events that I have personally witnessed or that I have recreated with the help of participants in them."