The Grand National Party also filed complaints with the National Election Commission against two of Roh's top aides, The Korea Times reported Tuesday.
Roh asked that he be permitted to defend himself before the commission.
"Every country allows its leaders to undertake political activities. The GNP has criticized the government for the past four years since I took office. So I responded to them with the speech,'' Roh said in the Times' article.
On Saturday, Roh said the GNP had no vision, the newspaper reported.
"The GNP has kept arguing the government has failed, the economy is bankrupt and the whole country is in crisis. I would say let's look at the evidence," he said.
The GNP complaint said Roh failed to remain neutral in politics. The commission was expected to issue a ruling this week.