Portugal's president on Thursday announced a snap legislative vote for May 18 -- the third national election in barely three years -- after Prime Minister Luis Montenegro resigned over a conflict of interest dispute.

Portugal will hold an early parliamentary election - its third in just over three years - on May 18, President Marcelo Rebelo de Sousa said on Thursday, two days after the centre-right minority government lost a parliamentary confidence vote.

Portuguese voters are becoming increasingly frustrated with the country's political elites as another snap election looms - without any signs that it will bring stability. Portugal's centre-right minority government collapsed on Tuesday after Prime Minister Luis Montenegro lost a confidence motion,

Voters in Portugal may be asked to go to the polls for the third time in as many years after the centre-right government of Prime Minister Luis Montenegro loses a vote of confidence. "People have become very disillusioned with the political class,