"I've always found it sad that a group of women spend so much time attacking another woman, whose only goal is to help children", Grisham wrote. "That is what these adult women were doing to the first lady", Bruce said.
Conspiracy theories that a stand-in is occasionally used for the first lady date back to at least 2017, when Melania Trump appeared in sunglasses and a raincoat as the president defended his response to Hurricane Maria in Puerto Rico.
Bruce, who is president of Independent Women's Voice, elaborated on the "mean girl environment" that led to the popular movie Mean Girls.
"This is obviously one of the most lovely women in the world and she was mourning here, as normal people would". Hosts of the ABC programme debated whether an impostor had travelled with Trump.
"Some people think that the first lady is using an imposter", Behar said, mockingly, before pulling up a tweet that included screengrabs of the first couple side by side in Opelika, Ala., on Friday. "She's attractive, and we're doing this in jest".
The first lady's spokeswoman Stephanie Grisham called the show's joking on the subject "shameful".
News images are not to be altered beyond basic toning and cropping, she said.
Fox & Friends co-host Ainsley Earhardt said it was "so hypocritical". Abby Huntsman, a Republican on the panel, followed up by asking, "Does that make it better?"
The president reflected in the interview on his trip with the first lady to Alabama to visit victims and pay respects to the 23 who died in the tornado.