The AAPOR’s executive council said in a statement carried by the Associated Press news agency: “When asked to provide several basic facts about this research, Burnham refused.”

It said it wanted to know the wording of questions asked and instructions and explanations given to respondents.

“Dr Burnham provided only partial information and explicitly refused to provide complete information about the basic elements of his research,” said Mary Losch, chair of the association’s standards committee.