0651 GMT February 25, 2020
During the first Prime Minister's Questions (PMQ) of 2020, Johnson said the US was obliged to let people attend the United Nations, The Guardian reported.
The US visa denial came in outright violation of the terms of a 1947 UN Headquarters agreement which requires Washington to allow foreign officials into the country for UN affairs.
Iranian Foreign Minister Mohammad Javad Zarif on Tuesday denounced Washington’s refusal to issue him a visa for attending an upcoming United Nations Security Council meeting, saying US statesmen are vastly terrified of someone going to their country and conveying the truth to the American people.
On Wednesday, Johnson faced his first PMQs of the year amid rising tensions in the Middle East following the US airstrike in Baghdad on Friday that assassinated Iranian military commander Qassem Soleimani.
Corbyn used the first PMQs since the Christmas break to berate the prime minister over his stance supporting the US in its assassination of General Soleimani.
He used some of his six questions to raise questions about the legality of killing the general in Iraq.
While Johnson retorted: "The strict issue of legality is not for the UK to determine since it was not our operation."
During the heated debate, the outgoing opposition leader said Johnson was unable to stand up to President Donald Trump "because he has hitched his wagon to a trade deal with the United States".
This government's response is not putting the interests of this country first but instead seems more interested in prioritizing the prime minister’s relationship with Trump over the security of the region and of this country," Corbyn said. Johnson called the claim "absolute fiction".
Johnson also said the British government should be doing everything it can to protect the integrity of Iraq.