The National Conference working president's response came days after Congress leader Ghulam Nabi Azad alleged that NC government in the state was a "failure".
"He (Azad) did not see my government as a failure when I was trying to make (Congress vice-president) Rahul Gandhi the prime minister of the country. He should have talked about these things seven months before. He did not see my government as a failure when I was trying to make him a MP in Udhampur.
"I acted against (Congress minister G M) Saroori and Peerzada Syed. I even ordered a vigilance inquiry against my deputy CM (Tara Chand) and his department.
"If Azad felt that Congress ministers were corrupt, why he did not take action against them?... This is opportunistic politics. I do not do it and if Azad wants to do it, he is welcome," Omar told reporters here.
The chief minister also said he was "surprised" that Congress was solely opposing National Conference (NC) during the campaign.