Kepcher assisted Trump in his search for an apprentice in his reality TV show and also managed his Trump National Golf Club, until she was relieved of her duties last month.
People magazine claimed Trump was unhappy at Kepcher's growing fame, claiming she was too distracted by her own promotional activities and endorsement deals to manage his golf firm.
Stewart and Trump famously fell out earlier this year, after the cookery queen claimed the property tycoon's failure to step down from the reality show had affected the ratings of her spin-off show The Apprentice: Martha Stewart.
She says, "Donald is out of control. By the time he's finished, he will have fired everyone around him and there will be nobody left.
"And poor Donald will be sitting there on his little pedestal all by himself. He needs to be careful!"
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