SEOUL, South Korea (AP) _ Legislators of South Korea's largest opposition party threatened today to resign as a group to protest what they said was political suppression by President Kim Dae-jung.

The lawmakers' anger stems from efforts by prosecutors to arrest or question eight opposition members on charges of taking bribes from businessmen to finance a presidential campaign last December.

Prosecutors, who have denied their investigation is politically motivated, have said at least one ruling party legislator also was being investigated.

The Grand National Party accused Kim of using an anti-corruption campaign to break up the No. 1 opposition party.

``We can no longer sit idle. We will step up our fight,'' said Rep. Ahn Sang-soo, opposition spokesman.

Ahn said all his party's 138 lawmakers were prepared to resign en masse to protest the investigation. It was not clear when they would step down.

Despite the threat, Kim, elected in December, vowed today to push his anti-graft campaign further. His ruling coalition controls 155 seats, or a majority of five seats, in the country's single-chamber, 299-seat National Assembly.