President Trump's frustration in Washington is reaching a boiling point, and is in "pressure cooker territory," The Washington Post reported, citing a confidant of the president.

That Trump ally warned that when Trump does not vent his frustration and anger, he turns into a "pressure cooker" — and that may be what is happening now, according to the Post.

Trump has launched a volley of attacks and complaints on Twitter in recent days, taking aim at targets ranging from Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) to the NFL.

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According to the Post, Trump has become frustrated with his Cabinet and feels as if he has not received the credit he deserves for his response to recent hurricanes that ravaged parts of the mainland U.S. and its territories.

In a series of tweets on Sunday, the president railed against Corker, who had said last week that Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE, Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE and White House chief of staff John Kelly John Francis KellyMORE were separating the U.S. from "chaos."

The Tennessee Republican, the president said, had decided not to run for reelection because Trump would not give him his endorsement. Trump also blamed him for the Iran nuclear deal, which the president has blasted as "one of the worst deals" the U.S. has ever made.

Corker responded on Sunday, tweeting that the White House has become "an adult day care center" under Trump. And in a subsequent interview with The New York Times, he warned that the president's rhetoric could be driving the U.S. toward "World War III."

In recent months, Trump has found himself unable to express his frustrations to others in the White House, according to the Post. Kelly has largely restricted access to the president, and the recent departure of Keith Schiller, a longtime aide, has left Trump with fewer peers to vent to.