Donald Trump threatens to 'tell the real story' about Joe Scarborough and Mika Brzezinski

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Donald Trump took his escalating feud with "Morning Joe" to a new level on Monday, threatening to "tell the real story" of the relationship between hosts Joe Scarborough and Mika Brzezinski.

In a series of tweets on Monday, the Republican presidential nominee slammed the MSNBC hosts over their criticism of his brash campaign style.

See Mika and Joe together through the years

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'Morning Joe' co-hosts Joe Scarborough and Mika Brzezinski through the years
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'Morning Joe' co-hosts Joe Scarborough and Mika Brzezinski through the years
NBC NEWS -- Time's 100 Most Influential People In The World 2008 Gala -- Pictured: (l-r) MSNBC's 'Morning Joe' co-host Mika Brzezinski and host Joe Scarborough attend Time's '100 Most Influential People in the World' Gala at Jazz at Lincoln Center in New York City, NY on May 8, 2008 (Photo by Curtis Means/NBC/NBCU Photo Bank via Getty Images)
NEW YORK - SEPTEMBER 23: MSNBC's Morning Joe Host Joe Scarborough and Co-Host Mika Brzezinski attend the 2008 Moves Power Women event at The Carlton on September 23, 2008 in New York City. (Photo by Charles Eshelman/FilmMagic)
MORNING JOE -- Airdate 03/13/2009 -- Pictured: (l-r) Co-host Mika Brzezinski, Co-host Joe Scarborough (Photo by Virginia Sherwood/NBC/NBCU Photo Bank via Getty Images)
NEW YORK - APRIL 7: 'EXCLUSIVE' Joe Scarborough and co-host Mika Brzezinski host the 'Morning Joe' show on MSNBC on April 7, 2009 in New York City. Scarborough is currently the host of Morning Joe on MSNBC, and had previously hosted Scarborough Country on the same channel. Scarborough served in the United States House of Representatives from 1995 to 2001 as a Republican from the 1st district of Florida. (Photo by Charles Ommanney/Getty Images)
NEW YORK - APRIL 7: 'EXCLUSIVE' Joe Scarborough and co-host Mika Brzezinski host the 'Morning Joe' show on MSNBC on April 7, 2009 in New York City. Scarborough is currently the host of Morning Joe on MSNBC, and had previously hosted Scarborough Country on the same channel. Scarborough served in the United States House of Representatives from 1995 to 2001 as a Republican from the 1st district of Florida. (Photo by Charles Ommanney/Getty Images)
MORNING JOE -- Pictured: (l-r) Willie Geist, Mika Brzezinski, Joe Scarborough -- Broadcastng from New Orleans' John McDonogh High School, MSNBC's Joe Scarborough, Mika Brzezinski and Willie Geist encourage viewers with a community involvement call-to-action (Photo by Cheryl Gerber/NBC/NBCU Photo Bank via Getty Images)
WASHINGTON - APRIL 28: Mika Brzezinski and Joe Scarborough attends the 2010 Atlantic Council awards dinner at the Ritz Carlton Hotel on April 28, 2010 in Washington, DC. (Photo by Leigh Vogel/WireImage)
MORNING JOE -- Pictured: (l-r) Mika Brzezinski, Joe Scarborough, Vice President Joe Biden -- 'Morning Joe' co-hosts Joe Scarborough and Mika Brzezinski speak with Vice President Joe Biden (Photo by Stephen J. Boitano/NBC/NBCU Photo Bank via Getty Images)
UNIVERSAL CITY, CA - MAY 12: Joe Scarborough and Mika Brzezinski attend 'An Evening With NBC Universal' at The Cable Show 2010 at Universal Studios Hollywood on May 12, 2010 in Universal City, California. (Photo by Jason LaVeris/FilmMagic)
MORNING JOE -- Pictured: (l-r) Mika Brzezinski, Willie Geist, Sarah Jessica Parker, Joe Scarborough (Photo by Peter Kramer/NBC/NBCU Photo Bank via Getty Images)
MEET THE PRESS -- Pictured: Mika Brzezinski, co host, center, and host Joe Scarborough, right, appear on 'Morning Joe' for the Morning Joe Bipartisan Health Challenge in Washington, D.C., Thursday, Sept. 16, 2010. (Photo by William B. Plowman/NBC/NBCU Photo Bank via Getty Images)
MORNING SHOW LUNCHEON -- Pictured: (l-r) Morning Joe hosts: Mika Brzezinski, Joe Scarborough at NBC's Morning Show Luncheon on September 23, 2010 (Photo by Peter Kramer/NBC/NBCU Photo Bank via Getty Images)
MORNING JOE -- Pictured: (l-r) Mika Brzezinski, Joe Scarborough -- MORNING JOE co-hosts broadcast live from EDUCATION NATION (Photo by Charles Sykes/NBC/NBCU Photo Bank via Getty Images)
MORNING JOE -- Live from Education Nation with Colin and Mrs. Powell September 28, 2010 -- Pictured (l-r) Co-hosts Mika Brzezinski, Joe Scarborough, Colin Powell, Mrs. Powell (Photo by Ali Goldstein/NBC/NBCU Photo Bank via Getty Images)
NEW YORK - OCTOBER 28: Mika Brzezinski and Joe Scarborough attend the Huffington Post 2010 'Game Changers' event hosted by Arianna Huffington at Skylight Studio on October 28, 2010 in New York, City. (Photo by Theo Wargo/WireImage for Huffington Post)
MORNING JOE -- Decision 2010 -- Pictured: (l-r) Co-host Mika Brzezinski, Host Joe Scarborough (Photo by Virginia Sherwood/NBC/NBCU Photo Bank via Getty Images)
NEW YORK - NOVEMBER 17: TV personalities Mika Brzezinski and Joe Scarborough attend the Robert F. Kennedy Center for Justice & Human Rights Ripple of Hope awards dinner at Chelsea Piers on November 17, 2010 in New York City. (Photo by Michael Loccisano/Getty Images)
NEW YORK - NOVEMBER 22: MSNBC Morning Joe hosts Joe Scarborough and Mika Brzezinski attends the S.L.E. Lupus Foundation's Life Without Lupus 40th anniversary gala at Avery Fisher Hall, Lincoln Center on November 22, 2010 in New York City. (Photo by John W. Ferguson/Getty Images)
NEW YORK, NY - DECEMBER 13: TV personalitys Mika Brzezinski and Joe Scarborough attend Paul McCartney plays World Famous Apollo Theater for first time, celebrating 20 Million Sirius XM Subscribers at The Apollo Theater on December 13, 2010 in New York City. (Photo by Larry Busacca/Getty Images for Sirius XM)
Morning Joe (l-r) Mika Brzezinski and Joe Scarborough discuss the escalating protests in Egypt on set. (Photo by Stacie Freudenberg/NBC/NBCU Photo Bank via Getty Images)
THE VIEW - (2.23.11) Joe Scarborough and Mika Brzezinski appeared on today's episode of 'The View.' 'The View' airs Monday-Friday (11:00 am-12:00 pm, ET) on the ABC Television Network. (Photo by Heidi Gutman/ABC via Getty Images)JOE SCARBOROUGH, MIKA BRZEZINSKI
MORNING JOE -- Live from Crenshaw High School -- Pictured: (l-r) Joe Scarborough, Mika Brzezinski (Photo by Matt Sersion/NBC/NBCU Photo Bank via Getty Images)
Television news personalities Joe Scarborough (L) and Mika Brzezinski attend the 2011 New York City Ballet Fall Gala at the David Koch Theatre at Lincoln Center on September 22, 2011 in New York City.
PASADENA, CA - JANUARY 07: (L-R) Host Joe Scarborough, co-hosts Mika Brzezinski, and Willie Geist speak onstage during the 'Morning Joe' panel during the NBCUniversal portion of the 2012 Winter TCA Tour at The Langham Huntington Hotel and Spa on January 7, 2012 in Pasadena, California. (Photo by Frederick M. Brown/Getty Images)
PALM BEACH, FL - FEBRUARY 17: Joe Scarborough and Mika Brzezinski attend the 7th Annual Everglades Foundation Gala at The Breakers on February 17, 2012 in Palm Beach, Florida. (Photo by Lucien Capehart/Getty Images)
PALM BEACH, FL - FEBRUARY 17: Mika Brzezinski and Joe Scarborough attend the 7th Annual Everglades Foundation Gala at The Breakers on February 17, 2012 in Palm Beach, Florida. (Photo by Lucien Capehart/Getty Images)
NEW YORK, NY - APRIL 11: Mika Brzezinski and Joe Scarborough attend the Hollywood Reporter celebration of 'The 35 Most Powerful People in Media' at the Four Season Grill Room on April 11, 2012 in New York City. (Photo by Larry Busacca/Getty Images)
NEW YORK, NY - MAY 08: Joe Scarborough and Mika Brzezinski arrive to 'Late Show with David Letterman' at Ed Sullivan Theater on May 8, 2012 in New York City. (Photo by Jeffrey Ufberg/WireImage)
New Jersey Governor Chris Christie is interviewed by Morning Joe's Joe Scarborough and Mika Brzezinski at The Republican National Convention in Tampa. (Photo by Brooks Kraft LLC/Corbis via Getty Images)
NBC NEWS - EVENTS -- NBCUniversal News Group Upfront -- Pictured: (l-r) Joe Scarborough, Mika Brzezinski -- (Photo by: Francine Daveta/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - APRIL 22: Joe Scarborough and Mika Brzezinski attends the 2013 Matrix Awards at The Waldorf=Astoria on April 22, 2013 in New York City. (Photo by Steve Mack/FilmMagic)
NEW YORK, NY - MAY 13: TV personalities Joe Scarborough (L) and Mika Brzezinski attend a book signing for Mika Brzezinski's book 'Obsessed: The Fight Against America's (and My Own) Food Addiction' at Barnes & Nobles Union Square on May 13, 2013 in New York, United States. (Photo by Michael Stewart/WireImage)
BOSTON - OCTOBER 30: Mika Brzezinski, left, and Joe Scarborough, right, in the stands before the game. The Boston Red Sox host the St. Louis Cardinals at Fenway Park for Game Six of the 2013 Major League Baseball World Series, Oct. 30, 2013. (Photo by John Tlumacki/The Boston Globe via Getty Images)
NEW YORK, NY - NOVEMBER 12: Joe Scarborough and Mika Brzezinski attend the 'The Right Path: From Ike To Reagan, How Republicans Once Mastered Politics - And Can Again' book event on November 12, 2013 in New York, United States. (Photo by Rob Kim/Getty Images)
TODAY -- Pictured: (l-r) Al Roker, Willie Geist, Dwain Schenk, Mika Brzezinski and Joe Scarborough appear on NBC News' 'Today' show -- (Photo by: Peter Kramer/NBC/NBC NewsWire via Getty Images)
NEW YORK, NY - MAY 01: TV personalities Joe Scarborough (L) and Mika Brzezinski of MSNBC attend the 2014 National Magazine Awards at The New York Marriott Marquis on May 1, 2014 in New York City. (Photo by Paul Zimmerman/Getty Images)
WASHINGTON, DC - APRIL 25: Television journalists Joe Scarborough and Mika Brzezinski attend the 101st Annual White House Correspondents' Association Dinner at the Washington Hilton on April 25, 2015 in Washington, DC. (Photo by Paul Morigi/WireImage)
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Trump claimed that he would share information about the personal relationship between the two hosts, the subject of much speculation.

"Tried watching low-rated @Morning_Joe this morning, unwatchable! @morningmika is off the wall, a neurotic and not very bright mess!" Trump wrote.

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Scarborough quickly responded in kind on Twitter, slamming the real-estate mogul over his comments about Brzezinski and refuting Trump's claims that the show's ratings are low.

Trump's comments on Monday come after months of criticism from the MSNBC hosts.

Last week, Scarborough authored an op-ed in the Washington Post urging Republicans to remove Trump from the ticket, citing his plan to bar all Muslims from entering the US and his refusal to tone down his occasionally authoritarian rhetoric.

The relationship between the hosts and Trump wasn't always tense.

Earlier in the campaign, critics charged the MSNBC hosts of going too easy on the real-estate magnate, whom Scarborough and Brzezinski predicted would be successful in the Republican primary. Scarborough told an audience at a New York event last year that he'd given Trump some advice in preparation for the Republican presidential debates. And during an interview in February, Trump characterized the hosts as "supporters," though both hosts refuted the assertion.

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