WASHINGTON — Senator John McCain expressed his deep gratitude and love of country in his final letter and implored Americans to put aside ‘‘tribal rivlaries’’ and focus on what unites.

Rick Davis, former presidential campaign manager for McCain who is serving as a family spokesman, read the farewell message Monday at a press briefing in Phoenix.

In the statement, McCain reflected on the privilege of serving his country and said he tried to do so honorably. He also touched on today’s politics.

‘‘Do not despair of our present difficulties but believe always in the promise and greatness of America, because nothing is inevitable here,’’ McCain wrote. ‘‘Americans never quit. We never surrender. We never hide from history. We make history.’’

McCain died Saturday from an aggressive form of brain cancer. Plans taking shape called for McCain to lie in state Wednesday in the Arizona State Capitol on what would have been his 82nd birthday. A funeral will be conducted Thursday at North Phoenix Baptist Church with former Vice President Joe Biden speaking.

In Washington, McCain will lie in state Friday in the Capitol Rotunda with a formal ceremony and time for the public to pay respects. On Saturday, a procession will pass the Vietnam Veterans Memorial and arrive for a funeral at Washington National Cathedral. Former Presidents George W. Bush and Barack Obama are expected to speak at the service.

The Senate has draped John McCain’s desk in black fabric and placed a vase of white roses on top. Monday was the Senate’s first day back in session since his death, though McCain had not been back to Washington since December.

A private funeral is planned for Sunday afternoon at the Naval Academy Chapel followed by a private burial at the academy cemetery.

President Trump was not expected to attend any of the services.

McCain was a noted critic of Trump, and Trump’s response to McCain’s death has been closely watched.

The flag atop the White House flew at half-staff over the weekend in recognition of McCain’s death but was raised Monday and then lowered again amid criticism.

Trump said Monday afternoon that he respects the senator’s ‘‘service to our country’’ and signed a proclamation to fly the US flag at half-staff until his burial.

When asked about Trump’s response to McCain’s death after the flag was raised Monday, Davis said that the family is focusing on the outpouring of support from around the world instead of ‘‘what one person has done or said.’’

‘‘The entire focus of the McCain family is on John McCain,’’ Davis said. ‘‘There really is no room in the McCain family today to focus on anything but him.’’

In Arizona, high-profile campaigns announced that they have suspended some activity this week.

McCain was just one of 11 US senators in the state’s 116-year history, and on Tuesday, primary voters will decide the nominees in races across all levels of government. There’s also the sensitive question of who will succeed McCain.

Arizona law requires the governor of the state to name an appointee of the same political party who will serve until the next general election. Since the time to qualify for November’s election is past, the election would take place in 2020, with the winner filling out the remainder of McCain term until 2022.

Possible appointees whose names circulate among Arizona politicos include McCain’s widow, Cindy McCain; former US Senator Jon Kyl; and Republican Governor Doug Ducey’s chief of staff Kirk Adams.

Throughout the weekend, Arizona politicos across all levels of government offered remembrances of McCain. Noting McCain’s death, several candidates, including Democratic Representative Kyrsten Sinema and Republican Representative Martha McSally, who are expected to win their party’s races for the state’s other US Senate seat, on Sunday evening said they would suspend their campaigns on Wednesday and Thursday. Ducey, whose office is coordinating services at the Arizona State Capitol for McCain, will not attend any campaign events between now and when McCain is buried.

Tributes poured in from around the globe. French President Emmanuel Macron tweeted in English that McCain ‘‘was a true American hero. He devoted his entire life to his country.’’ Israel’s prime minister, Benjamin Netanyahu, said McCain’s support for the Jewish state ‘‘never wavered. It sprang from his belief in democracy and freedom.’’ And Germany’s chancellor, Angela Merkel, called McCain ‘‘a tireless fighter for a strong trans-Atlantic alliance. His significance went well beyond his own country.’’

McCain was the son and grandson of admirals and followed them to the US Naval Academy. A pilot, he was shot down over Vietnam and held as a prisoner of war for more than five years. He went on to win a seat in the House and in 1986, the Senate, where he served for the rest of his life.

‘‘He had a joy about politics and a love for his country that was unmatched,’’ Senator Amy Klobuchar, Democrat of Minnesota, told CNN’s ‘‘State of the Union.’’ ‘’And while he never made it to the presidency, in the Senate, he was the leader that would see a hot spot in the world and just say, we need to go there and stand up for that democracy.’’

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The text of McCain’s letter:

‘‘My fellow Americans, whom I have gratefully served for sixty years, and especially my fellow Arizonans,

Thank you for the privilege of serving you and for the rewarding life that service in uniform and in public office has allowed me to lead. I have tried to serve our country honorably. I have made mistakes, but I hope my love for America will be weighed favorably against them.

I have often observed that I am the luckiest person on earth. I feel that way even now as I prepare for the end of my life. I have loved my life, all of it. I have had experiences, adventures and friendships enough for ten satisfying lives, and I am so thankful. Like most people, I have regrets. But I would not trade a day of my life, in good or bad times, for the best day of anyone else’s.

I owe that satisfaction to the love of my family. No man ever had a more loving wife or children he was prouder of than I am of mine. And I owe it to America. To be connected to America’s causes — liberty, equal justice, respect for the dignity of all people — brings happiness more sublime than life’s fleeting pleasures. Our identities and sense of worth are not circumscribed but enlarged by serving good causes bigger than ourselves.

‘Fellow Americans’ — that association has meant more to me than any other. I lived and died a proud American. We are citizens of the world’s greatest republic, a nation of ideals, not blood and soil. We are blessed and are a blessing to humanity when we uphold and advance those ideals at home and in the world. We have helped liberate more people from tyranny and poverty than ever before in history. We have acquired great wealth and power in the process.

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. 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.

We are three-hundred-and-twenty-five million opinionated, vociferous individuals. We argue and compete and sometimes even vilify each other in our raucous public debates. But we have always had so much more in common with each other than in disagreement. If only we remember that and give each other the benefit of the presumption that we all love our country we will get through these challenging times. We will come through them stronger than before. We always do.

Ten years ago, I had the privilege to concede defeat in the election for president. I want to end my farewell to you with the heartfelt faith in Americans that I felt so powerfully that evening.

I feel it powerfully still.

Do not despair of our present difficulties but believe always in the promise and greatness of America, because nothing is inevitable here. Americans never quit. We never surrender. We never hide from history. We make history.

Farewell, fellow Americans. God bless you, and God bless America.’’