Singh appealed External Affairs Minister Sushma Swaraj to resign in the wake of her intervention to "help a fugitive".
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"I have greatest regard for Sushmaji. Never expected her to intervene to help a fugitive evading Look Out Notice when he is holidaying!"
"She may be a victim of inner BJP fight as mentioned but now the matter is in Public Domain I appeal to her conscience and she should resign."
In another tweet taking a dig at the government over the Lalit Modi issue, Singh remarked "Ramdev and Balkrishna also being investigated by ED under Money Laundering Act for buying property in Scotland. This case may also be closed."
Former Finance Minister P Chidambaram also took a jibe at the government over the Lalit Modi issue via twitter.