The model Chrissy Teigen hit back after President Donald Trump described her in a tweet as singer John Legend's "filthy mouthed wife" without tagging her account.

She tweeted on Sunday night: "lol what a pussy ass bitch. tagged everyone but me. an honor, mister president."

Earlier in the day, Trump had accused Teigen and Legend of stealing credit for a criminal-justice-reform bill that Trump signed in December.

The First Step Act reduced mandatory minimum sentences for nonviolent drug offenses and eased the federal "three strike" rule that imposed a life sentence for three or more convictions.

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The model Chrissy Teigen has branded President Donald Trump a "pussy ass bitch" for not tagging her in a tweet in which he insulted her and accused her husband, the singer John Legend, of trying to steal credit for a criminal-justice-reform bill that Trump signed into law.

Legend on Sunday had appeared on an MSNBC program where he discussed his criminal-justice-reform initiative FreeAmerica.

This prompted a tweetstorm from the president, who said MSNBC was not giving him and other Republicans due credit for a recently enacted criminal-justice-reform law.

Trump was referring to the First Step Act, which he signed into law in December. The bipartisan law reduced mandatory minimum sentences for nonviolent drug offenses and eased the federal "three strike" rule imposing a life sentence for three or more convictions.

The law was partly aimed at redressing sentencing laws, which have disproportionally affected African Americans, Latinos, and Native Americans.

"But now that it is passed, people that had virtually nothing to do with it are taking the praise," Trump said. "Guys like boring musician @johnlegend, and his filthy mouthed wife, are talking now about how great it is — but I didn't see them around when we needed help getting it passed."

John Legend. Getty

Hours later Teigen, whom Trump blocked on Twitter, snapped back.

"lol what a pussy ass bitch. tagged everyone but me. an honor, mister president," she tweeted.

"the absolute best part of his tweet is I literally didn't speak in the special, nor was I mentioned," she added, referring to the MSNBC program. "I'm cackling at the pointless addition of me because he cannot not be a bitch."

Later, she and Legend encouraged followers to make #PresidentPussyAssBitch to trend by jokingly imploring people not to.

Legend also tweeted that Trump had nothing better to do with his Sunday night and jokingly asked the first lady, Melania Trump, to step in.

Teigen has ridiculed and criticized Trump on Twitter since 2012, long before his successful bid for the presidency.

Trump blocked her in July 2017 after she tweeted "Lolllllll no one likes you" to him after he complained that Republicans were not doing enough to "protect their president."