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The US ambassador to Nigeria has warned members of Nigeria's House of Assembly that their future official visits to the US could be in jeopardy over an alleged sexual assault that reportedly happened during a trip by some lawmakers to the US.

James Entwistle wrote a letter to the speaker outlining what allegedly happened and saying that when it was brought to the attention of other members of the delegation "they reacted very negatively... further calling into question their judgement".

But the lawmakers have denied the allegations and have threatened to sue the US government for character assassination.

Ten lawmakers were invited to the International Visitor Leadership Program held between 7-13 April in Cleveland, Ohio, and three of them were accused of gross misconduct.

In a response to the speaker of the House of Representatives, Mr Gololo dimissed the allegation as "totally false, baseless and unfounded".

"I categorically deny that any such incident happened," he added.

Mr Goloo said he was demanding an apology from the US government over the allegations or would take legal action to clear his name.