Melania Trump had a message for US President Donald Trump's first wife Ivana on Monday: enough of the self-serving comments.

The US first lady was responding to Ivana Trump's interview on Good Morning America in which she jokingly referred to herself as first lady while promoting her book, Raising Trump.

US President Donald Trump gives a thumbs up next to first lady Melania Trump during an official photograph with senior military leaders and spouses at the White House. Credit:Bloomberg

"I have the direct number to White House but I don't really want to call him there because Melania is there," the Czech-American, who was married to Donald Trump from 1977 to 1992, said. "I don't really want to cause any kind of jealousy or something like that because I'm basically first Trump wife, okay? I'm first lady, okay?"

Melania Trump's spokeswoman issued a statement that mentioned her son with Donald Trump, Barron.