Although Khan responded to past attacks from the president, he denied doing so this week, with his office saying that the mayor "has more important things than responding to Donald Trump's ill-informed tweet".
At Monday's White House press briefing, a reporter asked Deputy Press Secretary Sarah Huckabee Sanders if Trump actually thought 'the mayor was saying there's no reason to be alarmed by an attack on his city, ' which was viewed widely as a misinterpretation of Khan's advisement.
The US president then dismissed criticism that he had taken Khan's remarks out of context, accusing Khan of coming up with a "pathetic excuse" to defend himself.
"When you have a special relationship it is no different from when you have got a close mate".
Sadiq Khan said Trump was "wrong" about "many things" and should not be welcomed to the United Kingdom. Khan, who became the first Muslim mayor of a major Western capital city when he was elected in 2016, in October called Trump's campaign pledge to ban Muslims from entering the USA "ignorant". The point is there is a reason to be alarmed.
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The president kept up his attacks on Khan the next day.
The US Conference of Mayors also offered its support to Khan.
The president is expected to make an official visit in October following an invitation from Prime Minister Theresa May.
"MSM [mainstream media] working hard to sell it!" "There's no reason to be alarmed", he said during an interview.
Foreign Secretary Boris Johnson, who was Mayor until past year, strongly backed his successor on Tuesday.
However, Khan is stressing that policy divisions are harmful and should be acknowledged, yet he pays lip service to the "special relationship" between the US and England, which stands firm even while Trump's acting like a persistent, insult-tossing mosquito.
It comes as Theresa May faced calls to scrap Mr Trump's visit to Britain following the US President's latest attack on Mr Khan, accused by Liberal Democrat leader Tim Farron of being a "supine leader" and urged by Labour MP David Lammy to "show some bottle".
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