Few returning Republicans have displayed much appetite for taking on McCain's role as a legislator willing to openly challenge the scandal-plagued president.
"'Fellow Americans' - that association has meant more to me than any other. I feel compassion for him and his family as they go through this".
"Ten years ago, I had the privilege to concede defeat in the election for president", McCain said.
Sen. John McCain on the floor of the Senate, July 25, 2017.
"Finally, I have asked General John Kelly, Secretary James Mattis, and Ambassador John Bolton to represent my Administration at his services". "He was at times the conscious of the nation", Graham said.
Mr Trump and Mr McCain had a long-running feud and the statement appeared to take a swipe at the president.
The service at the National Cathedral in Washington will feature eulogies by former Presidents Barack Obama and George W. Bush. Trump's antipathy for McCain bordered on the personal.
Throughout McCain's illness, Trump continued to publicly snub him - including at a recent appearance in which the president declined to say McCain's name when signing a bill that was named for him. A private funeral will follow at the Naval Academy Chapel and McCain is to be buried at the academy cemetery. 'The flag is down'.
While flags remained at half mast at the Capitol, the Washington Memorial and elsewhere, the White House flag was raised on Monday.
"We weaken our greatness when we confuse our patriotism with tribal rivalries that have sown resentment and hatred and violence in all the corners of the globe", the statement read. 'We weaken it when we hide behind walls, rather than tear them down, when we doubt the power of our ideals, rather than trust them to be the great force for change they have always been'.
Trump campaigned on a promise to build a wall across the US border with Mexico and force Mexico to pay for it.
Mr McCain died on Saturday, aged 81, after choosing to end medical treatment for brain cancer.
Trump will not be attending the senator's funeral on Saturday as McCain banned his attendance before his death.
In response to another question, Davis told reporters that the family's thoughts were exclusively on McCain.
He declined to answer any question's about the flag or Trump's response to McCain's death. McCain, for his part, recently slammed Trump's Helsinki meeting with Russian President Vladimir Putin as "one of the most disgraceful performances by an American president in memory".
Hoang Thi Hang, a Hanoi resident who also signed the condolence book, said he had great respect for McCain's compassion. They choose to focus on that'. How do you accurately be able to give somebody their due justice who served the United States for 60-plus years, I mean dedicated his entire life?