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The war of words between Republican presidential rivals Donald Trump and Ted Cruz is growing uglier by the day.

Now their wives, Melania Trump and Heidi Cruz, are being dragged into the mudslinging.

The latest exchange was sparked when an anti-Trump super PAC launched an ad that shows Melania posing nude during a 2000 GQ photo shoot. It suggested that voters should turn out for Cruz or Melania could be the next first lady.

Trump quickly responded with a threat:

Lyin' Ted Cruz just used a picture of Melania from a G.Q. shoot in his ad. Be careful, Lyin' Ted, or I will spill the beans on your wife! — Donald J. Trump (@realDonaldTrump) March 23, 2016

Cruz pointed out that the ad came from a super PAC that's not affiliated with his campaign, also calling Trump a "coward" for going after his wife:

Pic of your wife not from us. Donald, if you try to attack Heidi, you're more of a coward than I thought. #classless https://t.co/0QpKSnjgnE — Ted Cruz (@tedcruz) March 23, 2016

Trump, however, wasn't buying it:

Lyin' Ted Cruz denied that he had anything to do with the G.Q. model photo post of Melania. That's why we call him Lyin' Ted! — Donald J. Trump (@realDonaldTrump) March 23, 2016

The social media battle took another turn Wednesday after Trump retweeted a picture of Melania alongside an unflattering image of Heidi:

Cruz responded, chastising Trump for attacking a woman:

Donald, real men don't attack women. Your wife is lovely, and Heidi is the love of my life. https://t.co/pprXhIMzUT — Ted Cruz (@tedcruz) March 24, 2016

Watch Howard Kurtz react to these "locker room taunts" above.

See Andrea Tantaros' reaction, here.

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