Mitt Romney did not back down from his feud with Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE at a GOP dinner Tuesday night.

The former Republican presidential nominee joked about the billionaire’s foreign-born wives.

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“Donald Trump has had several foreign wives. It turns out that there really are jobs Americans won’t do,” Romney reportedly quipped at the annual dinner hosted by the National Republican Congressional Committee (NRCC).

Mitt Romney at @NRCC dinner: "Donald Trump has had several foreign wives. It turns out that there are really are jobs Americans won't do." — Kris Hammond (@KrisHammond) March 23, 2016

Trump’s first wife, Ivana, was born in Czechoslovakia. Melania, his third wife, is from Slovenia.

Romney also touched on Trump’s questioning of his faith.

“He could have just asked my wives,” Romney said.

Mitt on Trump at NRCC dinner on whether he's actually a Mormon: "He could have just asked my wives." — Keith Urbahn (@keithurbahn) March 23, 2016

Trump bashed Romney at a rally in Utah last week, asking his supporters if Romney was really Mormon.

“Are you sure he’s a Mormon? Are we sure?” Trump said.

The billionaire has since said it was joke.