A federal judge has refused to permit an insanity defense for one of the New York politicians about to go on trial for corruption.

Former New York City Councilman Daniel Halloran had hoped to tell the jury about brain surgery he underwent in 2012 to remove a benign tumor. His lawyer suggested the operation had a "residual mental effect."

Judge Kenneth Karas ruled Tuesday that Halloran raised the issue too late — last week — and that there wasn't enough supporting evidence.

Halloran's trial begins Wednesday. His co-defendants are state Sen. Malcolm Smith and Vincent Tabone, who's former vice chairman of the Queens Republican Party.

Prosecutors say the three men engaged in a bribery scheme to get Smith, a Democrat, onto the GOP ballot for mayor last year.