LDP lawmaker Takanori Sakai was arrested Friday on suspicion of violating the Political Funds Control Law immediately after the House of Representatives stripped him of his Diet immunity.
Lawmakers are protected from arrest, unless Diet members vote otherwise, while the legislature is in session.
Prosecutors said Sakai violated the law by ordering his secretaries not to report some 120 million yen in corporate donations between 1997 and 2001.
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