Brazilian President Dilma Rousseff has vowed to fight to "the last minute" despite the desertion of two allies ahead of Sunday's impeachment vote.

Ms Rousseff, who says her opponents are plotting a "coup", faces claims she manipulated government accounts. On Tuesday two parties formerly in her coalition said they would vote in favour of the impeachment motion. If two-thirds of the lower house vote for impeachment, the motion will then pass to the Senate.

The Progressive Party (PP), which quit the coalition on Tuesday, says most of its 47 MPs would vote for the impeachment, and the Republican Party (PRB) said its 22 members had been told to vote for it. The move comes weeks after the PMDB, the largest party in the the lower house, voted to leave the coalition. MPs from Ms Rousseff's own Workers' Party are said to be increasingly despondent about Sunday's vote. Football metaphor The allegations, which Ms Rousseff denies, are that she juggled the accounts to make her government's economic performance appear better than it was ahead of her election campaign two years ago. The president's supporters say the issue is not valid grounds for impeachment anyway. While Tuesday's developments have weakened Ms Rousseff's position ahead of the impeachment vote, its outcome is uncertain, with many members of the lower house still undecided. In an interview on Wednesday the president said she would fight the impeachment proceedings "until the last minute of the second half", employing a metaphor from the world of football.

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