Despite the public appearance of a strong friendship, President Joe Biden privately sparred with Benjamin Netanyahu several times over the Israeli prime ministers lack of strategy in Gaza, as documented in a new book by veteran journalist Bob Woodward.

Woodwards book, War, reveals new details about both Biden and former President Donald Trumps sometimes expletive-laden statements to and about certain world leaders like Netanyahu and Russian President Vladimir Putin while facing multiple international crises. The books release date is Oct. 15, but CNN published some excerpts it obtained on Tuesday.

It has been one year since Hamas militants attacked southern Israel, killing about 1,200 people and capturing around 240 about 100 of whom remain in captivity, a third of whom are presumed dead. In response, the Israeli military continues to rain chaos and havoc on Palestinians in Gaza, killing about 42,000 people, displacing nearly the entire population of 2.3 million and collapsing the territorys whole health care system .

Despite increasing disapproval from people in and out of his administration , Biden has publicly served as Israels strongest ally, as evidenced by a constant stream of weapons and funding to the military, protecting the Israeli government at the United Nations and providing close to no accountability for the militarys clear violations of international human rights law.

However, in private, Biden has allegedly criticized Netanyahu.

That son of a bitch, Bibi Netanyahu, hes a bad guy. Hes a bad fucking guy! Biden told an associate in the spring, according to Woodward. Politico first reported this same explosion in February, meaning the president may have expressed the sentiment even earlier.

In response, Biden spokesperson Andrew Bates told Politico that the president never said such a statement, and that the two leaders have a decades-long relationship that is respectful in public and in private.