Grant Shapps says he is barred from sharing his theories on why Donald Trump is "in cahoots" with Vladimir Putin.
The former defence minister told Times Radio he's "got some theories" as to why Trump "seems to support the tyrant", but he's held up by a 30-year closure rule.
"I have some theories as to why, but I may have to wait for the 30-year rule to talk about them," Mr Shapps said.
The rule refers to the release of public records after a thirty-year closure period. The Constitutional Reform and Governance Act 2010 reduced the closure to 20 years.
