"My deepest sympathies and respect go out to the family of Senator John McCain. Our hearts and prayers are with you!" Trump posted Saturday evening shortly after McCain's death was announced. Sanders declined to comment Sunday afternoon. "It's atrocious," Mark Corallo, a former spokesman for Trump's legal team and a longtime Republican strategist, said of Trump's reaction to McCain's death. "At a time like this, you would expect more of an American president when you're talking about the passing of a true American hero." Loading Replay Replay video Play video Play video The break with precedent of previous presidents - who have typically released effusive official statements for noteworthy Americans upon their death - underscored the bitter relationship between the two men, Trump's continued anger toward McCain and the substantive and stylistic differences between them, people close to both men said.

Trump conspicuously avoided a national moment of tribute to a senator whose death seemed to be its own metaphor for the demise of civility and unity in the Trump era. The president did not make a cursory public show of respect Sunday for McCain, against whom he had continued to indulge a personal grievance even as it was apparent the Arizona Republican was losing his battle with brain cancer. The president spent much of the day golfing and attacking his usual enemies on Twitter. It was the start of what promises to be a difficult week for Trump. McCain quietly declared before his death that he did not want Trump to take part in his funeral, a decision that will render the president a virtual pariah as the senator is eulogised by former presidents and other luminaries as a principled war hero and dedicated public servant. Republican Senator John McCain. Credit:AP

But more than just the culmination of a political feud, the spectre of Trump's highly visible absence from McCain's funeral observances underscored the degree to which the president has veered from the norms of his office, unwilling to act as a unifying force at major moments in the life of the country. "Everyone, including him, is more comfortable with him not there, and that's a striking thing on its own, given that he is the president of the United States, and this was a sitting senator who is respected by both sides," said Bill Kristol, the conservative commentator and editor at large of The Weekly Standard. "For better or worse, he's outside what would have been the bipartisan boundaries, you might say, of American presidents." The dynamic reflects a president who wants nothing to do with the establishment and views almost everything as a zero-sum game that revolves around himself. It also highlights the country's rabid political polarisation, which helped propel Trump to the White House. On Sunday, an admiring tribute to McCain tweeted by Alexandria Ocasio-Cortez, a progressive Democratic candidate for a New York congressional seat, was greeted by hundreds of vitriolic replies attacking the dead senator and branding Ocasio-Cortez a sellout and a panderer for praising him.

Some of Trump's supporters, for their part, savaged McCain on social media, calling him a spiteful person who had betrayed his own party and blackballed the president as his dying wish. McCain — whom Trump once mocked for his 5 1/2 years as a prisoner of war — spent the final months of his life as an outspoken Republican voice challenging Trump at a time when many in his party would not. "For most of American history, politics stopped when you had the death of a national leader, and the fact that it hasn't says an awful lot about the current state of our country and our politics, and in particular about Donald Trump," presidential historian Michael Beschloss said. "What you'd want to see is a president acting as graciously and as large-mindedly as possible, in the John McCain spirit, but there is no sign of that yet." McCain had made his wishes clear during the months before his death, as he convalesced at his ranch near Sedona, Arizona, receiving visitors and fielding telephone calls from a cast of prominent well-wishers across the political spectrum and around the world. The president was never one of them. His references to McCain in recent months were confined to contempt-filled moments at his political rallies when he would mimic the thumbs-down signal the senator had made when he voted against repealing the Affordable Care Act. So intense was Trump's animus for McCain that, when he travelled to Fort Drum, New York, this month to sign a defence bill named in the senator's honour, the president refused to utter his name. Nor did Trump join leaders from both parties on Friday in sending sympathy to McCain and his family after it was announced that he was stopping treatment for his cancer. He died a day later.

In the past, funerals for prominent US political leaders have often served a healing function, Beschloss noted. President John F. Kennedy's funeral in 1963 offered a backdrop for former Presidents Harry Truman and Dwight D. Eisenhower to resolve a more than decade-long feud, as they stood together outside the Cathedral of St. Matthew the Apostle and later sat down for a drink together near the White House. Before President Richard Nixon's funeral in 1994, he and his vice president, Spiro Agnew, had not spoken to each other in more than 20 years, as Agnew held a grudge against Nixon for pushing him to resign. However, when he was invited to attend, Agnew agreed. But when former first lady Barbara Bush died this year, Trump stayed away from a funeral that drew four of the five living former presidents and first lady Melania Trump, who posed in an iconic photograph with her husband's predecessors that seemed to highlight his exclusion from the nation's most exclusive club. Such periodic comings-together to mourn or recognise a major moment in the nation's history have been a staple of presidential leadership, presidential historian Jon Meacham said. "From Washington all the way through to President Obama, presidents have had to play a unifying and even transcendent role in affirming a sense of national unity," Meacham said. "It has been and it continues to be almost unthinkable that the 45th president could follow in that tradition, and this is yet another example of his inability to bring disparate forces together even on ceremonial occasions."

McCain's plan for his funeral — that he be eulogised by both Bush and Obama, the two presidents from opposing political parties who vanquished him in his runs for the White House — has only underscored the contrast, Meacham added. "John McCain, in death," he said, "is performing the unifying function that the incumbent president is congenitally incapable of performing." Washington Post, New York Times