Republican presidential candidate Donald Trump took aim at rival Ted Cruz's wife in a vicious tweet that quickly went viral.
Trump, the GOP front-runner, took to the social media site on March 22 after the Cruz campaign referenced Trump's wife in an ad.
"Lyin' Ted Cruz just used a picture of Melania from a G.Q. shoot in his ad," Trump's tweet read. "Be careful, Lyin' Ted, or I will spill the beans on your wife!"
The New York Post reported that despite Trump's claim of Cruz himself using the photo, it was an outside group that created the ad.
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Cruz later fought back in a tweet of his own.
"Donald, if you try to attack Heidi, you’re more of a coward than I thought," the tweet read.
Both Trump and Cruz have been gaining steam in the primaries and racking up endorsements -- even from former candidates. Former Gov. Jeb Bush of Florida recently announced his support for Cruz.
"Ted is a consistent, principled conservative who has demonstrated the ability to appeal to voters and win primary contests, including yesterday’s Utah caucus," Bush wrote in a Facebook post.
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The post continued:
"Washington is broken, too many families are stuck in poverty and Western civilization is under attack from radical Islamic terrorists, as evidenced by the horrific attack in Brussels, which was preceded by attacks in Paris and California.
"For the sake of our party and country, we must overcome the divisiveness and vulgarity Donald Trump has brought into the political arena or we will certainly lose our chance to defeat the Democratic nominee, most likely Hillary Clinton, this fall. That is the only way we can reverse President Obama’s failed domestic and foreign policy agenda, and turn our country around.
"Republicans can win back the White House and put our nation on a path to security and prosperity if we support a nominee who can unite our party and articulate how conservative policies will help people rise up and reach their full potential."
Trump has secured endorsements from his former rivals, including Ben Caron and Gov. Chris Christie of New Jersey, both of whom he previously butted heads with on the campaign trail.