"Letter of MPs was signed in India & used in USA. Due to lack of faith in CBI, BJP may appeal to President Obama for an impartial inquiry by FBI," Congress General Secretary Shakeel Ahmad said on Twitter.
Ahmad, who is in London on a personal visit, had raked up a controversy last week with his remark linking the birth of terror outfit Indian Mujahideen to 2002 Gujarat riots.
Ahmad's comment on the letter purportedly written by 65 MPs asking the US administration not to change its policy in denying visa to the Gujarat Chief Minister comes even as the party has refrained from either endorsing or condemning the move, saying it is for the signatories to respond.
Some of the MPs including CPI(M) leader Sitaram Yechury, whose signatures have found on the letter, have already denied their role into it.
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The US had taken a decision not to give a visa to Modi in the aftermath of post-Godhra riots in Gujarat in 2002.
The party has alleged that it appeared to be the handiwork of the "dirty tricks department" of the Congress.