McCain memoir said to reveal his 'no-holds-barred opinions' on Washington

McCain's memoir is scheduled to be released May 22.

“Candid, pragmatic, and always fascinating, John McCain holds nothing back in his latest memoir,” is how a description reads on Simon and Schuster's online catalog web site.

“In his forty years in politics McCain has never been afraid to buck trends or ruffle a few feathers. His words are more important today than ever,” the description says, adding that "McCain shares his experiences during the divisive 2016 election."

McCain’s memoir, "The Restless Wave," is expected to be released May 22.

Earlier this year, McCain slammed Trump for his political hits on the Department of Justice and the FBI. Trump accused the beleaguered agencies of bias against Republicans and maligned the top leaders he himself appointed.

“Our nation’s elected officials, including the president, must stop looking at this investigation through the warped lens of politics and manufacturing partisan sideshows,” McCain said in a statement.

“President Trump does not seem to understand that his rhetoric and actions reverberate in the same way. He has threatened to continue his attempt to discredit the free press by bestowing “fake news awards” upon reporters and news outlets whose coverage he disagrees with,” McCain wrote in an op-ed published in the Washington Post in January.

“Whether Trump knows it or not, these efforts are being closely watched by foreign leaders who are already using his words as cover as they silence and shutter one of the key pillars of democracy,” he wrote.

Despite McCain's illness, Trump blasted him at the Conservative Political Action Conference in February.

"Except for one senator, who came into a room at 3 o’clock in the morning and went like that, we would have had health care too, we would have had health care too, think of that," Trump said, imitating the thumbs-down motion McCain made during the late-night vote on the measure.

Editor's note: The description of McCain's memoir has been updated for clarity.