Joao Vale de Almeida was this week formally installed as the EU's ambassador to the US, and suggested that American officials should regard him as their first point of contact for transatlantic discussions.
He is the first EU ambassador to be appointed after the controversial Lisbon Treaty gave the EU sweeping new powers.
The new ambassador claimed to now be "leading the show" among European representatives in Washington.
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Mr Vale de Almeida's comments are also likely to alarm Sir Nigel Sheinwald, the British ambassador in Washington. Sir Nigel is thought to have struggled to build strong relations with the White House after a memorandum he wrote for Gordon Brown questioning Barack Obama's experience was leaked in 2008.
http://www.telegraph.co.uk/news/worldnews/europe/eu/7941313/New-EU-ambassador-in-Washington-claims-transatlantic-authority.html