The European Parliament is "totally ridiculous", EU Commission President Jean-Claude Juncker said in a heated outburst in Strasbourg on Tuesday.
Mr Juncker was angered by only around 30 MEPs attending a plenary session to discuss the Maltese presidency of the EU.
EU Parliament President Antonio Tajani berated Mr Juncker and asked him to show more respect, adding: "The commission does not control the parliament. It is the parliament that should be controlling the commission."
Mr Juncker responded: "There are only a few members in the parliament to control the commission. You are ridiculous."
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European Commission President Jean-Claude Juncker has said the UK cannot negotiate a trade deal with the EU while it remains a member of the bloc.
Speaking in an interview to be aired on German radio on Saturday, Mr Juncker added he doubted the remaining 27 member states would be able to maintain unity following Brexit, and that the UK's departure would cause divisions among the remaining states.
"The other EU 27 don't know it yet, but the Brits know very well how they can tackle this," Juncker told Deutschlandfunk radio.
"They could promise country A this, country B that and country C something else and the end game is that there is not a united European front."
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A feisty exchange between European Commission President Jean-Claude Juncker and a BBC journalist has signified the tense atmosphere at the EU leaders' summit in Brussels.
Asked about Thursday's dinner with Theresa May and the rest of the EU leaders, an apparently irritated Mr Juncker scoffed before replying: "We had no special event with Theresa May yesterday, she was explaining what her intentions are.
"I will have lunch with her and then we'll see what has to happen."
When pressed by the journalist on what he proposed to discuss with Mrs May, Mr Juncker retorted sternly: "Are you the British prime minister?"
EU leaders have warned that Mrs May faces tough negotiations if she insists on a "hard Brexit".
However, European Council President Donald Tusk has insisted that no formal Brexit talks will be held until Article 50 is invoked.
The European Union's chief executive has called for a joint military headquarters and greater defence cooperation between nations as he outlined plans to combat the costly loss of Britain from the European Union.
Analysts believe Brexit could reduce the EU's military capacity by a quarter as Europe's biggest spending power departs the bloc, unless action is taken to change current defence arrangements.
European Commission President Jean-Claude Juncker said no single EU government had a military big enough to deal with security threats on Europe's doorstep as he bid to revive long-running efforts to reduce the bloc's reliance on the United States.
In his annual speech to the European Parliament, Mr Juncker said: "We must have a European headquarters and so we should work towards a common military force. This should be to complement NATO."
He added: "From an economic point of view, bringing together our military resources could be clearly justified. The lack of cooperation is something that is costing Europe 20 to 100 billion euros (£17bn-£85bn) a year."
Officials later stressed it was not a call for an EU army.
The European Union "respects and regrets" Britain's decision to leave but is not at risk from Brexit, European Commission president Jean-Claude Juncker has said in a keynote speech.
Juncker used his annual State of the Union speech to reject claims Britain's exit signalled the start of a breakdown of the European political project.
"Allow me to state here and today that we respect and at the same time regret the UK decision but the European Union as such is not at risk," he said.
Juncker urged Britain to begin its exit "as quickly as possible".
He insisted relations with the UK "must remain on a friendly basis" throughout negotiations but warned Theresa May's government it couldn't pick or choose favourable elements of the EU, saying: "There can be no 'a la carte' access to the single market."
Juncker's speech also referenced the recent attack on a Polish man in Harlow as he addressed hate across the continent, saying: "Europe can never accept Polish workers being harassed, beaten up or even murdered in the streets of Essex."
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