"Any middle-class worker, you know, 'the Archie Bunker of the world' - that was a great show, I used to watch it - those guys are going to vote for him because those are smart guys," Icahn said.
MORE: Carl Icahn through the years
Carl Icahn through the years
Carl Icahn through the years
NEW YORK CITY - MARCH 13: Businessman Carl Icahn attends the Starlight Starbright Children's Foundation of New York's Fifth Annual Benefit Gala Honoring Carl Icahn on March 13, 1990 at New York Hilton Hotel in New York City, New York. (Photo by Ron Galella, Ltd./WireImage)
Carl Icahn during Lincoln Center for the Performing Arts Spring Gala - March 30, 2005 at The Rose Theatre at the Time Warner Center in New York City, New York, United States. (Photo by Robin Platzer/FilmMagic)
UNITED STATES - FEBRUARY 07: Billionaire investor Carl Icahn listens during an announcement of The Lazard Report in New York Tuesday, February 7, 2006. The report recommends forming separate companies for America Online, Time Warner Cable, the publishing unit, and film and TV networks, as well as buying back $20 billion in stock. (Photo by Daniel Acker/Bloomberg via Getty Images)
UNITED STATES - JUNE 10: Carl Icahn, a billionaire investor and chairman of Icahn Enterprises LP, greets guests after speaking at the New York Financial Writers Association dinner in New York, U.S., on Tuesday, June 10, 2008. Biogen Idec Inc. shareholders should reject Icahn's proposed slate of directors, the proxy advisers ISS Governance Services and Glass, Lewis & Co. said today. (Photo by Jeremy Bales/Bloomberg via Getty Images)
Carl Icahn, billionaire investor and chairman of Icahn Enterprises Holdings LP, stands outside of the Nasdaq MarketSite in New York, U.S., on Tuesday, March 27, 2012. Icahn announced his intention last month to offer $30 a share and give CVR Energy Inc. holders a right to as much as an additional $7 a share, a proposal that values the company at at least $2.6 billion, according to Bloomberg via Getty Images calculations. Photographer: Scott Eells/Bloomberg via Getty Images
Billionaire activist investor Carl Icahn speaks during a Bloomberg Television interview at the Robin Hood Investors Conference in New York, U.S., on Tuesday, Oct. 21, 2014. Icahn said Warren Buffett is sometimes 'way too easy' on companies in which his Berkshire Hathaway Inc. invests. Photographer: Peter Foley/Bloomberg via Getty Images
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"They know they are getting screwed, and that is what I think will happen," Icahn said in an apparent reference to the decline in U.S. manufacturing, a theme of Trump's.
Earlier Tuesday, Icahn tweeted that he believed Trump gave a "great speech" on Monday.
He also tweeted: "How many of our presidents, even our great presidents, would have handled the antics that went on in that auditorium as well as he did?"
Icahn was referring to protests during Trump's speech at the Detroit Economic Club. Trump kept his cool as about 14 protesters jumped to their feet and shouted at coordinated intervals as he spoke. (Reporting by Jennifer Ablan; Editing by Jonathan Oatis)