Woody Johnson, the US ambassador to UK, denies making racist comments.
Mr Johnson had been investigated by US officials after making “generalisations about black men” and “cringeworthy” comments about women’s looks.
He is alleged to have made the racist and sexist comments to staff and for allegedly trying to use his position to advance Donald Trump’s business interests.
Johnson is also said to have questioned why there needed to be a Black History Month, claiming that the “real challenge” was that black fathers did not stay with their families.
Mr Trump appointed him in 2017.
But the diplomat tweeted that the claims were “totally inconsistent with my longstanding record and values”.
“I have followed the ethical rules and requirements of my office at all times,” he wrote on Twitter.
“These false claims of insensitive remarks about race and gender are totally inconsistent with my longstanding record and values.”
A US State Department spokesperson said that Mr Johnson is “a valued member of the team” who has carried out his work in the UK “honourably and professionally”.
“We stand by ambassador Johnson and look forward to him continuing to ensure our special relationship with the UK is strong,” they added.
Mr Johnson, who is part-owner of NFL team the New York Jets, hosted US Secretary of State Mike Pompeo’s visit to London this week.
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