The Pentagon did not provide evidence to support its claims but said it hoped to further declassify intelligence supporting them.

William Barr has embraced that role. Likewise, Sipher stressed that the powers Trump granted Barr to declassify intelligence seem part of a political game.

Trump has given the attorney general the unilateral authority to declassify intelligence documents and has ordered the US intelligence community to "quickly and fully cooperate".

The report says the existence of Hitler's hidden finances are revealed in declassified intelligence documents at the US National Archives.