In a tweet where he linked an article to the website 'Guerilla Brexit', he claimed that the EU's supposed plans for an army are the same as Hitler's military ambitions, and you can imagine what the replies were like:
I’ve studied Nazi Germany in great detail and know as a matter of fact Hitlers plans for Europe are that of the EU’… https://t.co/CfzQgUExWl
Speculation about an EU army has run rife for years now and it is not entirely untrue. Although the union doesn't have its own army, it does encourage cooperation between its own member states with both Emmanuel Macron and Angela Merkel championing the idea in December.
However, the EU does not hold any power over its states which would force them into such an agreement, with each country allowed to right to veto such a decision and a unanimous decision would need to be reached in order for it to be approved.
As it stands the UK opposes such an idea, with the deputy leader of the House of Lords, Earl Howe, stating in June 2016:
The prime minister has been clear that the UK will never be part of a European Army. We have consistently said that we will oppose any measures which would undermine member states' competence for their own military forces, or lead to competition and duplication with NATO, which is the cornerstone of our defence.
While the idea for a so-called 'EU army' isn't entirely untrue, comparing these plans to the fascist regime of Nazi Germany is a bit of stretch.