Theresa May is under growing pressure to reveal the extent of her prior knowledge of Donald Trump's travel ban.
The Prime Minister met the President last week in Washington, before the publication of Mr Trump's executive order suspending the entry rights of travellers from seven Muslim-majority countries.
Now there are increasing calls from MPs for Mrs May to say whether she was briefed by presidential aides on the extent of the ban.
Mrs May has defended her invitation to invite Mr Trump for a state visit, despite the growing controversy, and Downing Street refused to comment.
A spokesman said: "You will have heard the Prime Minister and the president's comments following their discussions and we are not going to go into details of a private meeting."
Meanwhile, Lord Ricketts - a former head of the Foreign Office - said the offer of a state visit so early in Mr Trump's presidency was "premature" in a letter to The Times.
He said: "It would have been far wiser to wait to see what sort of president he would turn out to be before advising the Queen to invite him.
"Now the Queen is put in a very difficult position."