Lawyers for the German-born man who calls himself Clark Rockefeller are asking a Boston judge to throw out his kidnapping and assault convictions.

The defense is challenging the credibility of the state's mental health expert. They also fault the prosecutor for telling jurors not to allow Rockefeller to pull off the "ultimate manipulation" — an insanity defense.

Click here for photos.

Rockefeller is a German man whose real name is Christian Karl Gerhartsreiter. He was convicted earlier this month in the kidnapping of his 7-year-old daughter and the assault of a social worker.

His lawyers claim the state's expert was not qualified to testify about whether Gerhartsreiter was legally insane because he gave the wrong definition for criminal responsibility to the jury.

• Partial List of Witnesses at the 'Clark Rockefeller' Trial