European leaders will review the economic area's agenda after voters "sent a strong message" in the election which saw a surge from Eurosceptic parties, European Council President Herman Van Rompuy has said.
A Conservative MEP has called for an electoral pact between his party and Ukip as the Eurosceptic insurgency looked set to top a national election for the first time.
With most of the UK's 73 seats in the European Parliament declared, Ukip was on track to be the largest party in votes and seats.
Daniel Hannan, who was elected for the Conservatives in the South East region, said he believed there was a majority of votes on the right of the electorate in Britain.
He told Sky News:
Today EU leaders voted to back Jean-Claude Juncker as new president of the very powerful EU commission, which looks like business as usual.
In Essex the potential damage Ukip could do to Miliband's Downing Street elections is clear. He is there listening to voter's concerns.
The EU parliament is about to welcome the most Eurosceptic and right-wing intake in its history.