The nation's spy agency said it sent 168 surveillance reports on lawmakers to the presidential office during the Lee Myung-bak administration. 

The National Intelligence Service(NIS) disclosed the information at a parliamentary intelligence committee meeting on Tuesday, according to Reps. Kim Byung-kee and Ha Tae-keung that day. 

Of the reports, 19 were requested by the presidential office. They concerned corruption allegations of a then ruling party lawmaker and a list of donations to an opposition lawmaker. 

The specific contents of the reports weren't revealed, over which rival parties made opposing claims. 

The ruling Democratic Party requested that the NIS look into the legality of reviewing the reports. The main opposition People Power Party said the National Assembly should enact a special law before deciding to disclose the reports.