Former President Jimmy Carter released a statement extending condolences to Sen. John McCain's family and the people of Arizona "whom he represented so forthrightly for so many years."
Read Carter's full statement here:
"John McCain was a man of honor, a true patriot in the best sense of the word. Americans will be forever grateful for his heroic military service and for his steadfast integrity as a member of the United States Senate. Rosalynn and I extend our sincere condolences to Senator McCain's family and to the people of Arizona whom he represented so forthrightly for so many years."
Sen. Chuck Schumer announced he will introduce a resolution to rename the Russell office building after Sen. John McCain.
The Senate minority leader remembered McCain as a great person, saying he was "never afraid to speak truth to power in an era where that has become all too rare."
Moments ago, the White House flag was lowered to half-staff in honor of Sen. John McCain, who died this afternoon in Arizona.
First lady Melania Trump also shared her condolences on Twitter:
The Speaker of the House mourned the loss of the "decorated war hero and statesman," calling McCain "one of the most courageous men of the century."
Read Ryan's full statement:
This is a sad day for the United States. Our country has lost a decorated war hero and statesman. John McCain was a giant of our time—not just for the things he achieved, but for who he was and what he fought for all his life. John put principle before politics. He put country before self. He was one of the most courageous men of the century. He will always be listed among freedom’s most gallant and faithful servants. Our hearts are with his wife, Cindy, his children, and his grandchildren. This Congress, this country mourn with them.
Former President Barack Obama remembered Sen. John McCain's dedication to the nation.
"We saw this country as a place where anything is possible – and citizenship as our patriotic obligation to ensure it forever remains that way," he said in a statement.
Read Obama's full statement:
"John McCain and I were members of different generations, came from completely different backgrounds, and competed at the highest level of politics. But we shared, for all our differences, a fidelity to something higher – the ideals for which generations of Americans and immigrants alike have fought, marched, and sacrificed. We saw our political battles, even, as a privilege, something noble, an opportunity to serve as stewards of those high ideals at home, and to advance them around the world. We saw this country as a place where anything is possible – and citizenship as our patriotic obligation to ensure it forever remains that way. Few of us have been tested the way John once was, or required to show the kind of courage that he did. But all of us can aspire to the courage to put the greater good above our own. At John’s best, he showed us what that means. And for that, we are all in his debt. Michelle and I send our most heartfelt condolences to Cindy and their family."
Sen. John McCain's former running mate in the 2008 presidential election called him a "maverick and a fighter, never afraid to stand for his beliefs."
The Democratic senator from Illinois shared her condolences for John McCain on Twitter.
Cindy McCain took to Twitter to express her sorrow over the death of her husband Sen. John McCain.
"My heart is broken," she tweeted. "I am so lucky to have lived the adventure of loving this incredible man for 38 years."
Read her tweet:
GOP Sen. Lindsey Graham, a friend and sidekick of Sen. John McCain, said America lost one of "her greatest champions."