Wilders has argued that his views of Islam are supported by expert and academic analysis, and that the charges against him are an attack on the freedom of speech.
But at his Amsterdam trial, the prosecution countered that there is no general agreement about the nature of Islam, and Wilders' statements are opinions that cross the legal threshold.
Under Dutch law, it is illegal to insult or incite hatred against a group of people on the basis of gender, religion, race or sexuality.
"What he puts forward is, and remains, his individual opinion, and just like with any expression of opinion, we can test whether it falls under the right to freedom of expression or whether it is a transgression of the criminal code," said prosecutor Birgit van Roessel.
The case against Wilders is based on dozens of public statements. Typical among them were views he published in an opinion piece in the national newspaper De Volkskrant.
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