Michael D'Antonio, a CNN contributor and biographer who wrote "The Truth About Trump," told CNN on Sunday that he believes President TrumpDonald John TrumpTrump nominates ambassador to Turkey Trump heads to Mar-a-Lago after signing bill to avert shutdown CNN, MSNBC to air ad turned down by Fox over Nazi imagery MORE was "stewing" as political leaders past and present united to honor the late Sen. John McCainJohn Sidney McCainMark Kelly's campaign raises over M in days after launching Senate bid The Hill's 12:30 Report — Presented by Kidney Care Partners — Lawmakers wait for Trump's next move on border deal Mark Kelly launches Senate bid in Arizona MORE (R-Ariz.) this weekend.

“This is a man who is really impatient when anyone else has the public’s attention,” D’Antonio told CNN's Ana Cabrera.

“He is so devoted to drawing attention to himself that he has to be restrained from tweeting when it would be against his own interests," he added. "I think that even the act of going golfing during the ceremony yesterday demonstrated who he really is.”

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Trump did not attend services for McCain throughout the weekend, instead visiting his golf club in Virginia on Saturday and Sunday.

Vice President Pence spoke at a memorial service at the U.S. Capitol on Friday, while White House advisers Ivanka TrumpIvana (Ivanka) Marie TrumpTrump dismisses Ann Coulter after criticism: 'I hardly know her' On The Money: Trump to sign border deal, declare emergency to build wall | Senate passes funding bill, House to follow | Dems promise challenge to emergency declaration The Hill's Morning Report - Presented by the American Academy of HIV Medicine - Will there be any last-minute shutdown drama? MORE and Jared KushnerJared Corey KushnerThe Hill's Morning Report - Presented by the American Academy of HIV Medicine - Will there be any last-minute shutdown drama? Rule change sharpens Dem investigations into Trump Drama hits Senate Intel panel’s Russia inquiry MORE attended Saturday's memorial at the Washington National Cathedral.

“I think it pointed up the president’s absence but in many instances, Ivanka is the person that represents humanity in place of the president,” D'Antonio said. “I think it was to his benefit she [did] so. Just as it was to his benefit that Mike PenceMichael (Mike) Richard PenceBill Kristol resurfaces video of Pence calling Obama executive action on immigration a 'profound mistake' Pelosi dismisses GOP criticism of Omar: 'They do not have clean hands' Pence rips Omar's 'inadequate' apology for tweets criticized as anti-Semitic MORE delivered an address on Friday.”

While Trump was not present at Saturday's memorial, multiple speakers took subtle jabs at the president, with Meghan McCain stating in her eulogy that her father's America "is already great."

John McCain, who died last week at age 81 after being diagnosed with brain cancer, was buried on Sunday at the U.S. Naval Academy in Annapolis, Md.

Trump and McCain had a fraught relationship, with the Senate icon remaining one of the president's staunchest Republican critics even after his cancer diagnosis.

Trump drew criticism when he waited nearly 48 hours after McCain's death to issue a statement expressing "respect" for the late senator.