Donald Trump has vented his anger over media coverage of his repeated racism after a series of polls showed his approval ratings had fallen and that he was on track to lose the 2020 election.

The president lashed out in a series of Sunday-morning tweets, renewing his attack on The New York Times in an apparent continuation of his longstanding campaign to discredit news organisations which cover stories he does not approve of.

In the posts, he complains about the newspaper shifting its focus from coverage of special counsel Robert Mueller’s investigation into his campaign’s links with Russia to “a Racism Witch Hunt”.

“The reporting is so false, biased and evil that it has now become a very sick joke,” Mr Trump said: “With all that this Administration has accomplished, think what my Poll Numbers would be if we had an honest Media, which we do not!”

The president’s disapproval rating climbed to 56 per cent in Fox News polling published this week. That figure was just one point short of a record high and a five-point increase on last month.

In further ominous polling for the president, another Fox News survey found him to be less popular among voters than Democrat presidential candidates Joe Biden, Bernie Sanders, Elizabeth Warren and Kamala Harris.

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Mr Trump gave no examples of NYT stories which he deemed to be part of a “racism witch hunt”. But he appeared to be reacting to the newspaper’s executive editor, Dean Baquet, telling staff he wanted them to “write more deeply about the country, race, and other divisions” following the end of Mr Mueller’s inquiry.

The president’s recent racist attacks on four Democratic congresswomen of colour have been widely reported by media outlets around the world.

He repeatedly told Alexandria Ocasio-Cortez, Ilhan Omar, Ayanna Pressley and Rashida Tlaib – all US citizens, and all but one born in the US – to “go back” to their own countries.

The New York Times faced criticism over its coverage of such remarks, which it labelled “lowest-rung slur[s] … widely regarded as beyond the pale” when many other other publications had explicitly called out the president’s racism.

The newspaper sparked another backlash by headlining its coverage of massing shootings Dayton and El Paso: “Trump urges unity vs racism”.

After reader complaints that the headline failed to convey the president’s stoking of racial divisions, Mr Baquet held a staff meeting in which employees reportedly asked him about the paper’s reluctance to call Mr Trump “racist”.

While Mr Baquet defended the paper’s coverage, according to a transcript obtained by Slate, he said: “I think that we’ve got to change.