The prime minister insists there will be no change of direction
Tony Blair has insisted he will not be forced to change direction by Labour's poor showing at last week's elections.
The prime minister said he was not
"deaf to the voice of the electorate" but was convinced his decision to go to war in Iraq had been right.
And despite the UK Independence Party's gains in the European elections, he said he would not allow Britain to be "marginalised in Europe".
At his monthly news conference, he also promised a gear change on NHS reforms.
Labour and the Conservatives suffered their worst results for decades in the European elections, with UKIP more than doubling its 1999 vote to take 16% of the vote, pushing the Lib Dems into fourth place.
Tory leader Michael Howard has told his MPs he will not be blown off course by the elections.
*Seat change is adjusted to allow a direct comparison with the results from the 1999 election
UKIP quadrupled its number of MEPs from three to 12 with its best showing in the East Midlands, where it came within 0.3% of beating the Tories.
The Eurosceptic party's advances have put extra pressure on the prime minister as he tries to secure a deal on the proposed EU constitution.
Mr Blair said he wanted the right deal for Britain to emerge from the talks.
He said withdrawing from the EU, as advocated by UKIP, would be an "act of extraordinary foolishness".
"What we will not do is to marginalise Britain in Europe simply
for the sake of it," he vowed.
He added: "No politician can afford to be deaf to the voice of the electorate.
are clearly big challenges ahead for the country, concerns that we have to
address, big arguments to be won about the future direction of policy in this
country. But these are arguments I am prepared to win."
Once the new treaty was agreed, EU leaders together had to get back to focusing on cooperating on economic prosperity and security rather than "arcane" constitutional details.
One of the most important moves in Europe, which would also prove popular, would be to cut regulations coming out of Brussels, he said.
The Iraq war has been cited as a reason for the slump in support for Labour at the polls and Mr Blair acknowledged the conflict had dominated the agenda for many months.