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FILE - In this Jan. 13, 2019 file photo, Chrissy Teigen, left, and John Legend arrive at the 24th annual Critics' Choice Awards at the Barker Hangar in Santa Monica, Calif. President Donald Trump targeted the couple following an MSNBC special on criminal justice reform which Legend appeared on. In a series of tweets late Sunday, Sept. 8 and early Monday, Sept. 9 Trump felt he wasn’t getting credit for a law he signed in late December that, among other things, reduces mandatory minimum sentences in some cases. Trump called Legend “boring” and said Teigen was “filthy mouthed.” He criticized them for not playing a role in the reform. (Photo by Jordan Strauss/Invision/AP, File) Image Credit: Jordan Strauss/Invision/AP

In the latest example of President Donald Trump tangling with celebrity critics on social media, he called musician John Legend “boring” and the model Chrissy Teigen “filthy mouthed” in tweets late Sunday trumpeting the president’s achievements in criminal justice reform.

Teigen and Legend, a married couple who are both frequent critics of the president, fired back. Legend called on the first lady to intervene, and Teigen used vulgarities.

By Monday morning, the expletives used by Teigen — including one that Trump famously used in a recording that surfaced shortly before his election in 2016 — were part of a trending hashtag on Twitter. A related hashtag, #filthymouthedwife, was also trending.

In his tweets shortly after 11pm on Sunday, Trump appeared to be responding to Legend’s appearance at a criminal justice town hall that was hosted by the ‘NBC Nightly News’ anchor Lester Holt at the Sing Sing prison in Ossining, New York, and aired on MSNBC at 10 that night.

The president began by pointing to the criminal justice reform legislation he passed last year.

“Now that it is passed, people that had virtually nothing to do with it are taking the praise,” Trump wrote. “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.”

He did not name Teigen, which she noted in her response. “Tagged everyone but me,” she wrote. “An honour, mister president.”

She added that she had not been mentioned in the MSNBC special that Trump appeared to have watched.

Legend also jumped into the fray, and he called on the first lady to intervene.

“Imagine being president of a whole country and spending your Sunday night hate-watching MSNBC hoping somebody — ANYBODY — will praise you,” he said. “Melania, please praise this man. He needs you.”

Trump has often boasted about his own IQ and questioned the intelligence of others. He also has a habit of insulting prominent people of colour.

Last year’s criminal justice overhaul under the First Step Act was meant to expand job training and other programmes to reduce recidivism for federal prisoners; modify sentencing laws, including mandatory minimum sentences for nonviolent drug offenders; and enlarge early release programs.

Trump considers the bipartisan legislation one of his major accomplishments — one he hopes will broaden his appeal to voters. Some celebrities, including Kim Kardashian West and Kanye West, have been invited to the White House to discuss criminal justice and reducing criminal sentences.

But critics of the administration have raised questions about the pace of enforcement and the funding of the act. They have also noted that it addresses only the federal prison population, a tiny fraction of the people behind bars in the United States. (Legend has also pointed out that state laws — not federal ones — affect most incarcerated people in the US.)

Teigen is a prolific Twitter user who has long criticised Trump. In 2017, she tweeted that she had been blocked from viewing his account.

“After nine years of hating Donald J Trump, telling him ‘lol no one likes you’ was the straw,” she wrote.

Both she and Legend are vocal about their political beliefs and their opposition to the president’s policies. In 2014, Legend founded FreeAmerica, an organisation that highlights injustice in the criminal justice system.