The far-right Freedom Party of Austria (FPO) has filed a legal challenge disputing the result of last month's presidential run-off, Constitutional Court spokesman Christian Neuwirth confirmed on Wednesday. The FPO's Norbert Hofer was beaten by just 30,863 votes, but the party claims there were irregularities. FPO leader Heinz-Christian Strache sent a 150-page dossier to the court, according to reports.