British Prime Minster Theresa May is refusing to comment on renewed speculation that Conservative Party rivals are about to trigger a leadership challenge.

Some pro-Brexit Conservatives say May's opponents have reached the threshold of letters from 48 Conservative MPs needed to obtain a no-confidence vote.

If May lost, she would be replaced.

The claim has been made prematurely before, but anger with May has mounted over her handling of Brexit.

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The speculation came as May visited European capitals today seeking changes to a proposed divorce deal with the European Union so she can get it through Parliament.

Asked if she had been told whether the threshold had been reached, May said: "No, I have been here in Europe dealing with the issue I have promised Parliament I would be dealing with".

- AP