Sen. John McCain said he might write in his "old, good friend" Sen. Lindsey Graham for president when he casts his ballot next month, because he can't bring himself to vote for either Donald Trump or Hillary Clinton.
McCain was asked about his shifting position on Trump's candidacy as he sparred with his Democratic challenger for Arizona's U.S. Senate seat during their first debate Monday night.
McCain was asked why, after Trump's many controversies and personal attacks, including on himself, he hadn't withdrawn his endorsement until this weekend when a 2005 video surfaced of Trump bragging about groping women.
"When Mr. Trump attacks women and demeans the women in our nation and our society, that is a point where I just have to part company," the five-term Republican senator said. "I have daughters, I have friends, I have so many wonderful people on my staff. They cannot be degraded and demeaned in that fashion."
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John McCain through the years
John McCain through the years
20th August 1992: The Republican Senator from Arizona, John McCain, speaking at the Republican National Convention. A fomer prisoner of war for several years in Vietnam, he contested his party's nomination for the 2000 election. (Photo by Consolidated News Pictures/Getty Images)
HANOI, VIET NAM: U.S. Sen. John McCain, a former POW, looks 31 May 1993 at a display of personal belongings of American POWs at the joint POW/MIA archives center in the Hanoi Army Museum. McCain is with U.S. Sen. John Kerry and a delegation on a two-day visit aimed at obtaining more access to archives dealing with the fate of missing U.S. servicemen. (Photo credit should read HOANG DINH NAM/AFP/Getty Images)
UNITED STATES - FEBRUARY 27: TV RATINGS--Senate Commerce Committee Chairman John McCain, R-Ariz., during hearing on the TV ratings system. (Photo by Douglas Graham/Congressional Quarterly/Getty Images)
UNITED STATES - MAY 18: MCCAIN'S DAY--Sen John McCain, R-Ariz., relaxes in his office at about 2:15 p.m. (Photo by Scott J. Ferrell/Congressional Quarterly/Getty Images)
UNITED STATES - JUNE 02: McCAIN BILL--John McCain,R-Ariz.,during a press conference on the McCain Bill and tobacco legislation. (Photo by Douglas Graham/Congressional Quarterly/Getty Images)
WASHINGTON, : US Senator John McCain, R-AZ, chairman of the Senate Committee on Commerce, Science and Transportation begins the start of a hearing on the investigation of the scandal surrounding the 2002 Salt Lake City Winter Olympics on Capitol Hill in Washington, DC 14 April, 1999. AFP PHOTO/Mario TAMA (Photo credit should read MARIO TAMA/AFP/Getty Images)
HANOVER, : US Senator John McCain speaks to reporters 27 October,1999 in Hanover, New Hampshire. McCain criticized sugar, oil, and corn (shown behind) subsidies and linked them to 'soft money' campaign contributions. (ELECTRONIC IMAGE) AFP PHOTO Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)
MANCHESTER, : Republican president hopeful John McCain greets supporters as he arrives at a debate forum sponsored by a local television station 02 December, 1999, in Manchester, New Hampshire. McCain will debate the other Republican candidates seeking the party's presidential nomination. (DIGITAL IMAGE) AFP PHOTO/John MOTTERN (Photo credit should read JOHN MOTTERN/AFP/Getty Images)
UNITED STATES - CIRCA 2000: John McCain addresses a shadow convention at the Annenberg Center of the University of Pennsylvania. McCain was booed when he asked suppoters to back his former primary opponent, George W. Bush. The shadow convention was put on near the site of the Republican National Convention in Philadelphia to highlight issues that the organizers say the major parties are ignoring. (Photo by Harry Hamburg/NY Daily News Archive via Getty Images)
CAMDEN, UNITED STATES: GOP presidential hopeful US Senator John McCain (R-AZ) waves during an 'Old Fashion BBQ and Stump Meeting' on the front yard of a supporter's house 08 January 2000 in Camden, South Carolina. (ELECTRONIC IMAGE) AFP PHOTO/Paul J. RICHARDS (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)
PETERBOROUGH, NH - JANUARY 30: Republican presidential hopeful Sen. John McCain (L) and his wife Cindy are showered with confetti following McCain's final town meeting 30 January, 2000 in Peterborough, New Hampshire. (ELECTRONIC IMAGE) (Photo credit should read C.J. GUNTHER/AFP/Getty Images)
GREENWOOD, : Republican presidential hopeful John McCain makes a point 14 February 2000 during a town hall meeting at the American Legion Post 20 in Greenwood, South Carolina. McCain is campaigning heavily in the southern state against Texas Governor Geroge W. Bush ahead of the 19 February 2000 primary. (ELECTRONIC IMAGE) AFP PHOTO/Tim SLOAN (Photo credit should read TIM SLOAN/AFP/Getty Images)
THE TONIGHT SHOW WITH JAY LENO -- Episode 1789 -- Pictured: (l-r) Senator John McCain during an interview with host Jay Leno on March 1, 2000 -- (Photo by: Paul Drinkwater/NBC/NBCU Photo Bank via Getty Images)
UNITED STATES - APRIL 30: Sen. John McCain, R-AZ, at a Senate Commerce, Science and Transportation Committee hearing on climate change. (Photo By Tom Williams/Roll Call/Getty Images)
** FILE ** In this Feb. 11, 2002 file photo, a bandaged Sen. John McCain, R-Ariz., takes part in a Washington news conference. Three-time melanoma survivor McCain appears cancer-free, has a strong heart and is in otherwise general good health, according to eight years of medical records reviewed by The Associated Press. (AP Photo/Stephen J. Boitano, File)
Sen. John McCain, R-Ariz., speaks to supporters during a speech at a fund-raider Thursday, Feb. 20, 2003, in Phoenix. McCain committed to his re-election campaign Thursday by telling supporters that he wants to continue helping the nation when it faces a struggling economy and unpredictable foreign enemies. (AP Photo/Tom Hood)
En route to Las Vegas, Nev., President Bush, joined by Sen. John McCain R-Ariz, right, talks to reporters on Air Force One about his final campaign push on the morning after his final debate, Thursday, Oct. 14, 2004. (AP Photo/J. Scott Applewhite)
UNITED STATES - FEBRUARY 12: TEMPORARY GUEST WORKERS--Witness Sen. John McCain, R-Ariz., during the Senate Judiciary Immigration, Border Security and Citizenship Subcommittee hearing titled 'Evaluating a Temporary Guest Worker Proposal.' (Photo by Scott J. Ferrell/Congressional Quarterly/Getty Images)
UNITED STATES - JUNE 28: SENATE POLICY LUNCHES--Sen. John McCain, R-Ariz., talks to reporters after the Senate GOP policy luncheon. (Photo by Scott J. Ferrell/Congressional Quarterly/Getty Images)
WASHINGTON - SEPTEMBER 20: U.S. Senator John McCain (R-AZ) addresses The Northern Virginia Technology Council's Titans breakfast at the Capitol Hilton September 20, 2006 in Washington, DC. McCain spoke on a variety of subjects, including telecommunications legislation, net neutrality, research and development tax credits, immigration, and Internet taxes. He also addressed the rift that he and several other Republican senators are having with the White House over the Geneva Conventions. (Photo by Chip Somodevilla/Getty Images)
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"It's not pleasant for me to renounce the nominee of my party," McCain said. "He won the nomination fair and square."
His opponent, Rep. Ann Kirkpatrick, D-Ariz., seized on the opportunity to paint McCain as a hypocrite. "He's been trying to run from Trump's disparaging remarks for the last year while at the same time endorsing him over 60 times," she said.
Kirkpatrick also accused McCain of saying that he supported Trump having access to nuclear weapons — Democratic presidential nominee Hillary Clinton has raised doubts about Trump's mental fitness to be responsible with the nation's nuclear codes.
"I do not see a scenario where the finger would be on the button," McCain said.
Finally pushed on who he will vote for, McCain said he might write in Sen. Lindsey Graham, R-S.C.
"He's an old, good friend of mine, and a lot of people like him," McCain said. "The fact is, seriously, I cannot vote for either one [Clinton or Trump]."