In the 1932 German federal election, Delmer travelled with Hitler aboard his private aircraft. He was "embedded with Nazi party activists" at this time, "taking copious notes on everything from the style of the would-be Führer's oratory to the group think that lay behind the bond he was forming with the German people." He was also present in 1933 when Hitler inspected the aftermath of the "Reichstag" fire. During this period, Delmer was criticised for being a Nazi sympathiser, and for a time, the British government thought he was in the pay of the Nazis. At the same time, the Nazi leaders were convinced Delmer was a member of MI6; his denials of any involvement only served to strengthen their belief that he was not only a member, but an important one.