The Paris appeals court has ruled that investigating judges didn't break any laws when they tapped conversations between former President Nicolas Sarkozy and his lawyer in connection with a probe into past campaign financing.

The decision Thursday is a new blow to the conservative opposition leader as he eyes a 2017 presidential bid, because it allows investigations to resume.

Sarkozy is under preliminary charges for active corruption and influence-peddling based on information gleaned from the phone taps. He denies wrongdoing. It's among several legal cases he has faced since losing the presidency to Francois Hollande in 2012.

Sarkozy and his lawyer Thierry Herzog had protested the phone taps, saying they breached lawyer-client privilege. The appeals court ruled in favor of investigators, according to Herzog's lawyer, Paul-Albert Iweins.