NEW YORK: Ex-IMF chief Dominique Strauss-Kahn has filed a $1 million countersuit against the New York hotel maid at the center of last year’s explosive sexual assault allegations, a report said Tuesday.

A year after the scandal broke, the former French Socialist party presidential hopeful accused the maid, Nafissatou Diallo, of “knowingly and intentionally making a false report to law-enforcement authorities,” the New York Post said Tuesday citing court documents.

The countersuit lodged Monday at Bronx Supreme Court claims the maid’s “malicious and wanton false allegation” undermined Strauss-Kahn’s reputation and damaged “other professional opportunities,” said the filing, without specifying political ambitions that were rocked by the scandal, the Post said.

Before the allegations brought down the International Monetary Fund chief in the wake of his arrest last year in New York, Strauss-Kahn, 62, was seen as a champion of France’s Socialist Party and expected to beat vulnerable President Nicolas Sarkozy at the polls this year.

Instead Socialist candidate Francois Hollande stood against Sarkozy, and won, and will take the oath of office Tuesday.

The Post said Strauss-Kahn’s suit also charges Diallo with “malicious prosecution, abuse of process, false imprisonment, defamation and intentional infliction of emotional distress.”

His legal team was able to undermine the maid's criminal case last year, but the once-high-flying statesman has been helpless against a US judge who rejected his claim to diplomatic immunity and ordered a civil trial to go ahead.

Meanwhile in recent weeks Strauss-Kahn has been implicated in a prostitution ring probe in northern France, although he has insisted that he was unaware that women at the numerous orgies he took part in were prostitutes.