Former Vice President Dan Quayle said presumptive Republican presidential candidate Donald Trump has his full support and expects others in the party will follow suit, including House Speaker Paul Ryan.
"I've been a Republican all my life, I'm going to support the nominee," he said Thursday in an exclusive TODAY interview. "I predict that most people in my position, or people that have been in the Republican Party in a long time, will rally around the nominee."
Quayle, whose own qualifications to serve in high office once were questioned by the general public, said he believes Trump "has the capability" and instincts to be president.
"He's a winner. He's unusual. He's obviously very different, he's not going to play by the rules. It's a different situation, but I think that he can win," he said.
Quayle served as vice president under George H.W. Bush from 1989 to 1993. Both Bush and his son, former President George W. Bush, said recently through their spokesmen that they do not plan to endorse Trump.
See more of Dan Quayle through the years:
Dan Quayle through the years
Dan Quayle shows support for Donald Trump on TODAY Show: 'He can win'
AUG 18 1988, AUG 19 1988; New Orleans, La - Special to the Denver post - Sen. Dan Quayle reacts to Applause as he steps to the podium of the Republican National Convention.; (Photo By Jerry Cleveland/The Denver Post via Getty Images)
WASHINGTON DC - FEBRUARY 11: U.S President George H.W. Bush and staff brief the press in the Rose Garden at the White House about the visit of Cheney and Powell who had just returned from the Middle East prior to commencement of Desert Storm, the 1991 ground war with Iraq, February 11, 1991 in Washington, DC. Standing next to Bush is Secretary of Defense Dick Cheney (L), Chairman of the Joint Chiefs of Staff General Colin Powell, Vice President Dan Quayle. In the far back, (L-R) are National Security Advisor Brent Scowcroft (L, holding notebook), CIA Director Robert Gates, and Secretary of State Jim Baker. (Photo by David Hume Kennerly/Getty Images)
WASHINGTON, DC - NOVEMBER 10: Vice-President-elect Dan Quayle leaves the Executive Office Building where he had lunch with George Bush. (Photo by Craig Herndon/The Washington Post via Getty Images)
CHICAGO - 1990: Vice president of the United States Dan Quayle is seen warming up to throw a pitch prior to a Chicago Cubs game in May of 1990 at Wrigley Field in Chicago, Illinois. (Photo by Andrew D. Bernstein/Getty Images)
LITHUANIA - FEBRUARY 07: The American Vice President Dan Quayle in Vilnius, Lithuania on February 07, 1992 - The U.S. Vice President Dan Quayle during a visit to Vilnius. (Photo by Francis CHAVEROU/Gamma-Rapho via Getty Images)
National Party Conventions -- '1992 Republican National Convention' -- Pictured: (l-r) Wife of the VIce President Marilyn Quayle, Incumbent Vice President Dan Quayle during the 1992 Republican National Convention held at the Astrodome in Houston, TX on August 17-20 , 1992-- Photo by: Paul Drinkwater/NBCU Photo Bank
CARMEL, CA - FEBRUARY 3: Vice President Dan Quayle attending 'AT&T Pebble Beach National Pro-Am Golf Tournament' on February 3, 1995 at Pebble Beach in Carmel, California. (Photo by Ron Galella, Ltd./WireImage)
N 346568 001 02/11/99 & 02/12/99 New Hampshire Dan Quayle Campaigns For The Presidential Election In The Year 2000 (Photo By Jonathan Elderfield/Getty Images)
Republican Presidential candidate Dan Quayle gets a high five from a young supporter aboard his float at the Milford, New Hampshire Labor Day Parade, September 6, 1999. (Photo by Brian Snyder)
Former Vice President Dan Quayle (C) is flanked by former New Hampshire Governor and Bush White House Chief of Staff John Sununu (L) and New Hampshire Republican activist John Lamontagne, as he announces the formation of his presidential exploratory committee in Manchester, New Hampshire, February 11. [Quayle said he intends to seek the Republican nomination for President for the year 2000 election, starting with New Hampshire's first-in-the-nation primary in one year. ]
(OUTS: TEXAS NEWSPAPERS UNTIL 9/29/99) Former Vice President Dan Quayle with his wife Marilyn at his side announces in Phoenix, Arizona that he has decided to drop out of the race for President September 27,1999. (photo by Joe Raedle)
PHOENIX, AZ - SEPTEMBER 27: Republican presidential hopeful Dan Quayle, with his wife Marilyn, speaks at a press conference 27 September, 1999, in Phoenix. The former US vice president, lagging in the polls and low on cash, quit the race for the Republican presidential nomination. Quayle said he did not have the campaign cash to compete with Texas Gov. George W. Bush, the Republican front-runner, whose campaign funds recently topped 50 million USD. (Photo credit should read MIKE FIALA/AFP/Getty Images)
WASHINGTON - SEPTEMBER 10: Former vice president Dan Quayle (R) shares a moment with former President George H.W. Bush September 10, 2003 during an unveiling ceremony of a marble bust of Quayle on Capitol Hill in Washington, DC. Dan Quayle was the 44th vice president of the United States. (Photo by Alex Wong/Getty Images)
ST ANDREWS, UNITED KINGDOM - SEPTEMBER 30: Dan Quayle the former Vice-President of the United States of America shelters from the rain on the 17th hole during the second round of the Dunhill Links Championships on the Old Course, September 30, 2005 in St Andrews, Scotland. (Photo by Ross Kinnaird/Getty Images)
COLLEGE STATION, TX - JANUARY 20: Former President George H. W. Bush (R) greets former Vice President Dan Quayle at an event honoring the 20th anniversary of the Persian Gulf War on January 20, 2011 in College Station Texas. The Gulf War was waged against Iraq from August 1990 to February 1991 during President Bush's administration. (Photo by Ben Sklar/Getty Images)
CARNOUSTIE, SCOTLAND - OCTOBER 05: Former USA Vice-President Dan Quayle hits a shot during the second round of the Alfred Dunhill Links Championship on The Championship Links at Carnoustie on October 5, 2012 in Carnoustie, Scotland. (Photo by Richard Heathcote/Getty Images)
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Quayle said he found it amusing that Republicans know who their nominee is far before Democrats do, although he said he believes Hillary Clinton will ultimately be the candidate running against Trump.
"On paper, you'd say, 'Well, she's more qualified.' But you know what? He's more qualified in the sense that the American people, I think, want an outsider," he said. "They want an outsider this time. She is not an outsider, so if you're looking for an outsider, no she's not qualified and he is."