A source inside the Austrian Constitutional Court has said the presidential election will have to be held again amid allegations of irregularities in the handling of hundreds of thousands of votes.
Yesterday, the court ruled that local elections held in Leopoldstadt in October will have to be repeated.
University of Graz law expert Klaus Poier has said that a re run of the presidential election is certain if the claims of voting irregularities are substantiated by the court.
One allegation concerns the counting of about 60,000 votes by people who were not authorized to do so.
The Constitutional Court is to question 90 witnesses in a public hearing as its inquiry into voting in the second round of presidential election gets under way on Monday.
The court aims to have a decision by July 6th, two days before Establishment and open borders candidate Alexander van der Bellen is due to be sworn in.
The Interior Minister Wolfgang Sobotka has said a re run could be held in autumn.