Melania Trump says she loves President Donald Trump and has "much more important things to think about" than allegations he cheated on her with a porn star, a Playboy Playmate or anyone else.
Mrs. Trump, who was interviewed by the US's ABC network while touring Africa last week, said people are just spreading rumours about her marriage.
"I know people like to speculate and media like to speculate about our marriage and circulate the gossip," she said. "But I understand the gossip sells newspapers, magazines and, unfortunately, we live in this kind of world today."
She insisted allegations of her husband's infidelities are not a concern.
Asked in the interview if she loves her husband, Mrs. Trump said, "Yes, we are fine. Yes."
Trump, who during the 2016 presidential campaign was heard on an old "Access Hollywood" tape talking about groping and trying to have sex with women, has been accused of having multiple affairs.
Porn star Stormy Daniels and former Playboy playmate Karen McDougal said they had sex with him years ago.
Trump has denied the trysts with Daniels and McDougal but has acknowledged reimbursing his lawyer for a $US130,000 ($A182,716) hush money payment to Daniels. Mrs. Trump has generally kept quiet on the subject.
She played down a suggestion the repeated rumours of his philandering had put a strain on their marriage.
"It is not concern and focus of mine," she said. "I'm a mother and a first lady, and I have much more important things to think about and to do."
But when asked if the repeated rumours had hurt her, she paused. Then she reiterated the "media world is speculating".
"Yeah, it's not always pleasant, of course," she said. "But I know what is right and what is wrong and what is true and not true."
She also explained why she wore a jacket that said "I really don't care, do u?" on a trip to the border to visit migrant children who had been separated from their parents.
She noted that she wore the jacket getting on and off the plane, but not during her visits with children, and said it was a message to "people and the left-wing media who are criticising me".
Mrs. Trump said the jacket was a statement that the criticism will not stop her from doing "what I feel is right".
She said she could be "the most bullied person" in the world and women who make accusations of sexual assault need to "show the evidence".