North Korea's official KCNA agency has called Democratic nomination candidate Joe Biden "low IQ, and worse".

US President Donald Trump and North Korea's number one Kim Jong Un "agree" that Democratic candidate Joe Biden is incompetent, White House spokesman Sarah Sanders said Sunday. .

She was asked about a tweet from Donald Trump, posted on Saturday, in which the former real estate developer said he smiled when he heard that North Korea's official KCNA agency described Joe Biden as "low IQ, and worse."

North Korea fired by some small arms, which disturbed some of my people, and others, but not me. I have confidence that Chairman Kim will keep his promise to me, and also when he called Swampman Joe Biden a low IQ individual, and worse. Maybe that's sending me a signal?

- Donald J. Trump (@realDonaldTrump) May 26, 2019

Joe Biden leads polls for Democratic nomination

"Could you explain to us why Americans should not worry about the fact that the President of the United States is in favor of a murderous dictator over a former vice president of the United States?" Asked Sunday reporter Chuck Todd on the show Meet the Press on NBC. "The president does not fall into this position," said Sarah Sanders. "But I think they agree with their assessment of former Vice President Joe Biden".

76-year-old Joe Biden is well ahead of polls for the Democratic nomination for the US presidential election. Donald Trump has recently increased the number of direct attacks against him, nicknamed him "Joe-Dodo" ("Sleepy Joe"), "The Vicious" or "Swampman" on Saturday, in reference to one of his slogans campaign "Drain the Swamp" calling for rid of Washington's intrigues and conflicts of interest.