Michael D'Antonio, a CNN contributor and biographer who wrote "The Truth About Trump," told CNN on Sunday that he believes President TrumpDonald John TrumpHannity urges Trump not to fire 'anybody' after Rosenstein report Ben Carson appears to tie allegation against Kavanaugh to socialist plot Five takeaways from Cruz, O'Rourke's fiery first debate MORE was "stewing" as political leaders past and present united to honor the late Sen. John McCainJohn Sidney McCainTrump hits McCain on ObamaCare vote GOP, White House start playing midterm blame game Arizona race becomes Senate GOP’s ‘firewall’ 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 TrumpHard choices in training Americans for AI workplace of future Ex-Trump, progressive strategists battle over charges of anti-Semitism surrounding Eric Trump Ethics watchdog requests probe into Trump officials traveling to campaign events MORE and Jared KushnerJared Corey KushnerMueller investigating Russian payments made by Trump Tower meeting organizers: report The Hill's Morning Report — Sponsored by United Against Nuclear Iran — Kavanaugh confirmation in sudden turmoil Manafort’s plea deal — the clear winners and losers 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 PenceIndiana sisters with history of opposing Pence donate millions to Dems Hillicon Valley: Trump signs off on sanctions for election meddlers | Russian hacker pleads guilty over botnet | Reddit bans QAnon forum | FCC delays review of T-Mobile, Sprint merger | EU approves controversial copyright law Overnight Defense: Trump marks 9/11 anniversary | Mattis says Assad 'has been warned' on chemical weapons | US identifies first remains of returned Korean war troops 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.