European Union officials feel the U.S. had dealt Europe a "slap in the face", a member of the European Parliament said on Tuesday, following claims the U.S. National Security Agency bugged EU offices and hacked into its computer network.
"The EU has to respond pretty robustly to the Americans' activities. It's clear the U.S. have been involved in spying into EU institutions and activities. What I think we should be insisting on is that the U.S. issues a clear apology, and a commitment to end this activity," David Martin, a member of the European Parliament's International Trade Committee, said on Tuesday.
European leaders warned on Monday that the alleged bugging could derail major trade talks, with France's President Francois Hollande saying that Europe would hold off on any negotiations until it was sure the U.S. spying had ended.
(Read More: US Bugged EU Offices, Hacked Into Its Computers)
"A lot of people feel this is a slap in the face.The EU has made big efforts to get these talks underway and they feel extremely let down by the Americans," Martin said.
"I think it does weaken trust. There is no point running away from it. It does undermine confidence in each other's negotiating position and trust."
Reports published over the weekend by The Guardian newspaper and Germany's Der Spiegel, claimed the National Security Agency (NSA) had run an extensive program to spy on the EU representative's office in Washington as well as the EU office to the United Nations in New York. Der Spiegel also reported one spying operation had targeted an office that housed the EU Council of Ministers in Brussels.