Already facing a forgery case, Chhattisgarh Chief Minister Ajit Jogi seems to be in for more trouble as the Centre may launch a probe into how his son, an American citizen, could appear for the Indian Administration Service examination without first acquiring Indian citizenship.

Bharatiya Janata Party spokesman Prakash Jawadekar on Thursday told reporters that Amit Jogi, who was born in the US, is yet to submit the certificate of renunciation of his American citizenship to the Union home ministry.

Jawadekar also alleged that Amit had managed to sit in the 2001 IAS examination on the basis of a certificate, forged in 1986, testifying that he was a tribal.

"Amit did not pass the examination, else I would have been referring to the case of a collector. We demand a probe into the matter," he said adding, "Those responsible for holding the examination should conduct the probe."

BJP sources revealed that the MHA, headed by Deputy Prime Minister Lal Kishenchand Advani, was already seized of the matter.

Amid growing allegations and counter-allegations between the BJP and the ruling Congress six weeks before the assembly polls, Jawadekar said the Chhattisgarh chief minister had made himself vulnerable by his deeds.