Why did Silvio Berlusconi challenge the results of the 2006 Italian election?

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In the 2006 Italian general election, Silvio Berlusconi’s center-right coalition was defeated by a center-left bloc led by Romano Prodi. Following the narrow results, Berlusconi challenged the outcome, citing concerns over the validity of the vote.1

However, an Italian court subsequently reviewed the results and upheld Prodi’s victory. Following this legal confirmation, Berlusconi resigned from his position as prime minister in May 2006.1