Reading from prepared notes, the former model told the crowd in the half-full Milwaukee Theater, "As you may know by now, when you attack him he will punch back 10 times harder. No matter who you are, a man or a woman, he treats everyone equal."
The lengthy remarks were a first for Melania, who is rarely on the trail, and when she has spoken in the past has kept it brief.
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Melania Knauss and Donald Trump sit ringside for the Lennox Lewis-Michael Grant WBC/IBF Heavyweight Championship fight Saturday, April 29, 2000, at New York's Madison Square Garden. (AP Photo/Mark Lennihan)
New York mayoral hopeful Michael Bloomberg, real estate developer Donald Trump, and model Melania Knauss chat together at the Bloomberg pre-dinner party for the White House Correspondent's DInner at the Washington Hilton, Saturday April 28, 2001 in Washington. (AP Photo/ Bloomberg, John Harrington)
Donald Trump, left, watches a match between Roger Federer, of Switzerland, and Robby Ginepri, of the USA, with model Melania Knauss at the US Open tennis tournament in New York, Thursday, Aug. 30, 2001. (AP Photo/Richard Drew)
Melania Knauss, left, and Donald Trump arrive at the opening night party for Britney Spears' restaurant Nyla, at the Dylan Hotel in New York, Thursday, June 27, 2002. (AP Photo/John-Marshall Mantel)
**FILE**Donald Trump and Melania Knauss pose as they arrive for a charity event on board the Queen Mary 2 on April 24, 2004 in New York. The couple weds Saturday evening, Jan. 22, 2005, in Palm Beach, Fla. (AP Photo/Stuart Ramson)
Melania Trump poses for pictures as she arrives at the Costume Institute Gala held at the Metropolitan Museum of Art in New York, Monday , May 2, 2005. (AP Photo/Stuart Ramson)
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Donald Trump and Melania Knauss at the premiere of "War of the Worlds".
(NYC) (Star Max via AP Images)
Donald Trump and his wife Melania Knauss wait for the start of the showing of the Oscar de la Renta spring 2006 collection, Monday, Sept. 12, 2005, during Fashion Week in New York. (AP Photo/Diane Bondareff)
Donald Trump with his wife Melania arrive at The Jazz at Lincoln Center for a gala event celebrating Qatar Airways' inaugural flights to New York, Thursday, June 28, 2007, in New York. (AP Photo/ Louis Lanzano)
Melania Trump attend a screening of "The Duchess" hosted by The Cinema Society, Chanel and Vogue in New York on Wednesday, Sept. 10, 2008. (AP Photo/Peter Kramer)
Melania Trump attends The Museum of Modern Art Film Benefit honoring Baz Luhrmann on Monday, Nov. 10, 2008 in New York. (AP Photo/Evan Agostini)
Melania Trump arrives before the 83rd Academy Awards on Sunday, Feb. 27, 2011, in the Hollywood section of Los Angeles. (AP Photo/Matt Sayles)
Melania Trump attends the 'Dressed To Kilt' fashion show to benefit the Friends of Scotland Organization at the Hammerstein Ballroom on Tuesday, April 5, 2011 in New York. (AP Photo/Evan Agostini)
Donald Trump and Melania Trump attend the premiere of "Tower Heist" on Monday, Oct. 24, 2011, in New York. (AP Photo/Peter Kramer)
Melania Trump arrives at the Metropolitan Museum of Art Costume Institute gala benefit, celebrating Elsa Schiaparelli and Miuccia Prada, Monday, May 7, 2012 in New York. (AP Photo/Charles Sykes)
"Celebrity Apprentice" host Donald Trump and his wife Melania Trump arrive for the NBC network upfront presentation at Radio City Music Hall, Monday, May 14, 2012 in New York. (AP Photo/Evan Agostini)
Melania Trump pose for photos at a news conference, in New York, Thursday, May 1, 2014. (AP Photo/Richard Drew)
LAS VEGAS, NV - December 15, 2015: Donald Trump and Melania Trump pictured in the Spin Room at the CNN GOP Debate at The Venetain Resort in Las vegas, NV on December 15, 2015. Credit: Erik Kabik Photography/ MediaPunch/IPX
Republican presidential candidate Donald Trump leaves the stage with his wife Melania Trump and his daughter, Ivanka Trump. left, after the first Republican presidential debate at the Quicken Loans Arena Thursday, Aug. 6, 2015, in Cleveland. (AP Photo/Andrew Harnik)
Donald Trump is joined by his wife Melania in the spin room following the CNN Republican presidential debate at the Venetian Hotel & Casino on Tuesday, Dec. 15, 2015, in Las Vegas. (AP Photo/Mark J. Terrill)
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Meanwhile, Trump was on offense regarding delegate allocation and wins. Comparing the delegate fight to a prize fight, Trump pointed to Louisiana as a sign of the unfair nature of the delegate system.
"You see where I won Louisiana and then I find out that I am not supposed to get as many delegates as the person that I beat. What kind of stuff is that? And somebody said there is a rule and another rule. I don't care about rules, folks. I go out, I campaign, we win. We win. We get the delegates, right?"
He also predicted that he'll win the nomination before the convention, despite all the talk of delegate math and contested conventions.
Outside the rally, anticipated protests never came. Inside, interruptions were few and brief.
One person threw something at Trump during his remarks and missed. Trump security says the man left but they caught him. Officials said he was cited and released.