Choi, currently a lawmaker of the main opposition Liberty Korea Party, is suspected of having pocketed 100 million won (US$92,000) from the National Intelligence Service in 2014.
Investigators believe the money was paid to lobby him for retaining the spy agency's off-book funds when then-opposition parties pushed to scale them down on the basis of their untraceable nature.
Choi was questioned last week for the allegations. He has dismissed them as "false accusations." Source by the Yonhap.
