Gadkari filed the case in December, 2010 when Tiwari, as Congress spokesperson, had accused him of holding a benami flat in the scam-tainted Adarsh Society here.
He had contended in the complaint that this was false and defamatory and Tewari be tried for criminal defamation under the Indian Penal Code.
The local court had last month taken cognizance of Gadkari's complaint and had issued process against Tewari.
In Delhi, the BJP also released Tewari's letter to Gadkari.
