BERLIN: The inner circle of U.S. President Donald Trump has little knowledge about the European Union and Germany is having to explain how the worlds biggest trading bloc does business, the German governments transatlantic coordinator said on Thursday.

German Chancellor Angela Merkel was the go-to European ally for former U.S. President Barack Obama, who praised her as "an outstanding partner" on a farewell visit to Berlin in November, but the relationship has deteriorated markedly under Trump.

Speaking after talks with senior officials at the White House in Washington, Juergen Hardt told Der Tagesspiegel daily that the new U.S. administration seemed to be aiming for bi-lateral trade agreements with single EU member states.

"We first have to make clear that trade issues are not a national matter, but that they fall into the competence of the EU," Hardt said, adding that German officials had still a lot to explain to their new American counterparts.

"My impression is that the knowledge about the way the EU works is not very pronounced - at least not in Trumps inner circle," he noted.

Earlier, the U.S. news magazine World Trade Online reported that several EU member states had rebuffed requests from the Trump administration to negotiate bilateral deals.

Hardt added, however, that the new U.S. administration showed great interest in dialogue with Germany, pointing out that the planned U.S. delegation for the Munich Security Conference on Feb. 17-19 would be bigger than in the past.

"Thats a good sign," Hardt said.

The transatlantic coordinator urged all EU member states to speak with one voice and act in concert on major policy issues. "This should also help to increase the acceptance of the EU in Washington," Hardt said.

Foreign Minister Sigmar Gabriel is expected to meet his newly appointed U.S. counterpart Rex Tillerson for talks in Washington later on Thursday.

Ahead of his flight to Washington, Gabriel said on Wednesday that he wanted to shore up ties with Germanys closest ally outside Europe, days after a key Trump aide launched fresh attacks on Berlins policies.

Gabriel said he looked forward to a "good, open and friendly" dialogue with and said Germany was seeking answers about the new U.S. administrations foreign policies, its relationship with the NATO alliance and other key issues.

British Prime Minister Theresa Mays embrace of Trump has been galling for Britains closest European Union allies, who fear London is tilting too heavily towards the new U.S. administration ahead of Brexit.