The freakish theory, which has cropped up repeatedly throughout Trump's term in office, suggests that a body double for Melania accompanies the USA president at certain events, most recently a visit to survivors of a tornado in Alabama.
Trump's favorite TV program, Fox News' "Fox & Friends", reported on the body double theory Wednesday, following up on a Monday segment that aired on ABC's "The View".
The president said the internet rumor was another example of "fake news".
Trump expressed similar disdain for fake news hits on the first lady in an exclusive interview with Breitbart News this week.
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Bruce continued that The View hosts "can't appreciate or respect or enjoy something" and speculated they went on television to bash the first lady due to "issues" in their own lives. "They are only getting more deranged with time!" the president wrote.
The ABC hosts debated whether an impostor had traveled with Trump to Alabama to check on tornado damage and survivors. "Look how short she looks".
"The Fake News Media has been so unfair, and vicious, to my wife and our great First Lady, Melania", he tweeted at the time. That prompted co-host Joy Behar, who also disapproves of Trump, to say: "We're not here to be better people".
Stephanie Grisham, the first lady's spokeswoman, said the episode "went beyond the petty mean-girl spirit that we've grown accustomed to. Sorry", Behar said of one photo. "People died, people lost family, people are hurting in Alabama".