Graham defends McCain amid Trump attacks: 'Nothing about his service will ever be changed'

Sen. Lindsey GrahamLindsey Olin GrahamGraham emerges as go-to ally for Biden's judicial picks This Thanksgiving, skip the political food fights and talk UFOs instead Biden move to tap oil reserves draws GOP pushback MORE (R-S.C.) defended John McCainJohn Sidney McCainGOP senators appalled by 'ridiculous' House infighting MSNBC's Nicolle Wallace, Chris Christie battle over Fox News Trump's attacks on McConnell seen as prelude to 2024 White House bid MORE as "one of the most consequential senators" in history amid renewed attacks from President TrumpDonald TrumpStowaway found in landing gear of plane after flight from Guatemala to Miami Kushner looking to Middle East for investors in new firm: report GOP eyes booting Democrats from seats if House flips MORE against his late friend and GOP colleague.

"As to @SenJohnMcCain and his devotion to his country: He stepped forward to risk his life for his country, served honorably under difficult circumstances, and was one of the most consequential senators in the history of the body," Graham tweeted on Sunday.

"Nothing about his service will ever be changed or diminished."

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Graham, who is an ally of the president and was one of McCain's closest friends in the Senate, spoke out hours after Trump issued his second tweet in as many days targeting McCain.

The president disparaged McCain over reports that one of the then-senator's associates had shared a dossier of allegations about Trump's ties to Russia with the media.

"So it was indeed (just proven in court papers) 'last in his class' (Annapolis) John McCain that sent the Fake Dossier to the FBI and Media hoping to have it printed BEFORE the Election," Trump tweeted on Sunday. "He & the Dems, working together, failed (as usual). Even the Fake News refused this garbage!"

On Saturday, the president quoted former independent counsel Ken Starr, who called it a "very dark stain" against McCain that he had helped spread the dossier.

"He had far worse 'stains' than this, including thumbs down on repeal and replace after years of campaigning to repeal and replace!" the president tweeted, referring to the Arizona lawmaker's vote against the GOP Senate majority during the Republican attempt to repeal ObamaCare in 2017.

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.

McCain died last August, but the president has occasionally brought up his vote against the GOP effort to repeal ObamaCare in 2017 since then.