Former New Hampshire Gov. John Sununu (R) on Monday called former President Obama a “damn fool” for returning to the campaign trail last week to criticize President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE.

“What is this damn fool doing coming out of retirement to break with the tradition of not attacking sitting presidents? That was my first thought,” Sununu said on Fox News’s “America’s Newsroom.”

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Sununu, who was also a chief of staff to George H.W. Bush, accused Obama of hitting the campaign trail because he has an “insufferable ego.”

He also claimed that Obama is worried that if Republicans maintain control of the House and Senate, Congress will investigate “the shenanigans” of former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE and former FBI Deputy Director Andrew McCabe Andrew George McCabeGraham: Comey to testify about FBI's Russia probe, Mueller declined invitation Barr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' GOP votes to authorize subpoenas, depositions in Obama-era probe MORE.

“And all of a sudden these investigations will get to a point where people will start asking, ‘What did Obama know and when did he know it?’ And I think he’s trying to stave that off,” Sununu said.

Obama on Friday issued an intense rebuke of Trump while speaking at the University of Illinois, criticizing the president on issues ranging from his failure to condemn white supremacists after the deadly 2017 Unite the Right rally in Charlottesville, Va., to his administration’s response the same year to Hurricane Maria in Puerto Rico.

He also said Trump is “capitalizing on resentments politicians have been fanning for years."

Obama continued to take shots at the president in a separate speech Saturday in Anaheim, Calif., though he didn’t mention Trump by name.

Like Sununu, Vice President Pence criticized Obama for breaking with precedent by attacking his successor. Pence said on “Fox News Sunday” that it was “very disappointing” to see Obama “become so political.”