"If they helped this gentleman in any way. That's what we are curious about," the Congress Vice President told reporters here.
A row has erupted over the meeting of Vaidik, considered close to yoga guru Ramdev, with Saeed with the journalist rejecting suggestions made by Congress that he might have acted as government's envoy.
Vaidik had met the chief of Jamaat-ud-Dawa, said to be the parent organisation of terror outfit Lashkar-e-Toiba, in Lahore on July 2 while touring Pakistan along with a group of journalists and politicians invited by a peace research institute.
"Ya he is an RSS man. That's a known fact," Gandhi said to a question about Vaidik.
Congress has targeted the Prime Minister's Office over the meeting alleging its "direct involvement" and asked the government to "come clean" on the issue.Watch video: Ved Pratap Vaidik is an RSS man, says Rahul Gandhi
Congress leaders had also on Monday raised in Parliament and outside the issue of Vaidik meeting Saeed, saying the journalist was "very close to Sangh parivar" and rejected the government's contention that it had nothing to do with the meeting.
"Vaidik belonged to the same organisation Vivekananda International Foundation, whose three members Nripendra Misra, P K Mishra and Ajit Doval are working for the Modi government as Principal Secretary, Additional Principal Secretary in PMO and National Security Advisor (NSA) respectively," party spokesperson Shakeel Ahmed had said at the AICC briefing.