Norbert Hofer of the anti-immigration Freedom Party (FPO) lost the May 22 vote to former Greens leader Alexander Van der Bellen by less than one percentage point, with postal ballots having tipped the balance in Van der Bellen's favour.
Far-right on edge of power as Austria votes for president
The court said it was using its strict standard on the application of election rules.
Witnesses have told it of irregularities in the way the count was carried out, including the processing of postal ballots sooner than they should have been.
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