My deepest sympathies and respect go out to the family of Senator John McCain. 'Our hearts and prayers are with you!'
Trump's wife Melania also shared a heartfelt message on the social media platform.
President Barack Obama, who ran against McCain for the presidency in 2008, said that Americans remain in the former senator's debt because of all that he did for the country. He said "all of us can aspire to the courage to put the greater good above our own".
"John McCain was a man of honour, a true patriot in the best sense of the word", said the former president.
He was edged out by George W. Bush for the Republican presidential nomination in 2000, but became his party's White House candidate eight years later.
"John McCain and I were members of different generations, came from completely different backgrounds, and competed at the highest level of politics", Obama said.
In a 2002 memoir, McCain wrote, "I'm an independent-minded, well-informed public servant to some".
The Obamas shared their own lengthy message on Twitter too, praising his courage in both politics and the war, before sending their best wishes to Cindy and the rest of the senator's family.
Murray unsure of US Open readiness after Cincinnati exit
Murray, who had played so well in the second, opened the third by double-faulting a quick break away. "Physically, I felt okay". After Washington, I took four or five days off from the tennis court doing a lot of training, a lot of rehab.
'An American president does not lead the free world by congratulating dictators on winning sham elections, ' McCain said. John McCain's decades of service to his country in the hours after his death Saturday. Few have served their country so well or so long.
Following Trump's recent summit with Russian President Vladimir Putin, McCain caustically described the U.S. leader's behaviour as "one of the most disgraceful performances by an American president in memory". In the Senate, he was a mentor to so many senators: he taught us how to work with leaders on the world stage, and he taught us how to work with each other regardless of party back at home. His wife, Cindy McCain, unexpectedly adopted a child with a cleft palate from an orphanage run by Mother Teresa in Bangladesh in 1991. Connie and I are thinking of them now. McCain, then a lieutenant commander, volunteered for unsafe duty on the undermanned carrier Oriskany.
Arizona Gov. Doug Ducey, a Republican, will appoint a temporary replacement to represent the state in the U.S. Senate until the next general election.
"I hope, to impress on you again that it is an honor to serve the American people in your company", McCain said on July 25.
McCain's death marks the end of an extraordinary life in which the son and grandson of two Navy admirals rose from the bottom of his class at the U.S. Naval Academy to almost winning the presidency. "The Senate is keeping Cindy, the McCain family, all John's friends and staff, and the people of Arizona in our prayers at this tremendously hard time".
One day in November 2016, not long after Trump's surprise victory over Democrat Hillary Clinton, the Arizona senator exploded when journalists in the Capitol continued to pummel him with questions about the incoming president: "Do not ask me about Donald Trump". "Ones like him don't come along very often". McCain had succeeded another GOP political legend and past presidential candidate-Barry Goldwater in 1986.
Joe Biden: "John McCain's life is proof that some truths are timeless". Add John McCain as an interest to stay up to date on the latest John McCain news, video, and analysis from ABC News. "We will miss him dearly but take comfort in knowing his legacy will live on forever".