Finland's eurosceptic True Finns party has made big gains in the country's general election, coming third and making it a potential partner in a coalition government.
Finland's parliament, unlike others in the eurozone, has the right to vote on EU requests for bailout funds, meaning it could hold up costly plans to shore up Portugal and bring stability to debt markets.
The centre-right National Coalition narrowly won with 20.4% of the final vote but the True Finns made the biggest election gains of any party.
The party got 19.0% compared to 4.1% in 2007, which means it is likely to be involved in talks on forming a government.
True Finns leader Timo Soini said he wanted to change the terms of the bailout for Portugal.
'The package that is there. I do not believe it will remain,' Mr Soini said on public broadcaster YLE, referring to the rescue package being worked on for Portugal, the third eurozone country to need a financial rescue after Greece and Ireland.
Anxiety over unemployment and pension cutbacks also boosted support for the True Finns, which has a conservative social agenda but leans to the left on social welfare.
Finland's recent rebound from the global financial crisis has done little to boost the number of jobs.
Its flagship company, Nokia, is struggling to compete with Apple Inc and Asian handset makers and is expected to cut jobs soon.
Some Finns have expressed concern the True Finns' rise could turn the country off its course as the sole Nordic country to adopt the euro, with a place at Europe's main decision-making table.
The True Finns leader told Reuters his aim was for Finland to 'pay less to Brussels'.
'It is a bad deal,' he said of the Portugal plan.
Mr Soini said the party would at least 'get an invitation to talks' on a new government, which is expected to be formed in mid-to-late May.
Elsewhere, representatives of the European Commission, the European Central Bank and the International Monetary Fund are in Lisbon to set the terms for what would be the eurozone's third bailout in a year.