Michael Gove has refused to rule out being the source of reported comments made by the Queen on the EU.
During a Brexit campaign visit in Hampshire, the Justice Secretary said he did not know where The Sun got all of its information from.
Buckingham Palace has lodged a formal complaint with the Independent Press Standards Organisation (Ipso) about the report which appeared under the headline Queen Backs Brexit.
"I don't know how The Sun got all of its information," Mr Gove said.