Congress also sought immediate dismissal of Tomar, both as a Minister and MLA, while BJP slammed Aam Aadmi Party saying those who boasted of "politics of ethics" have been "unmasked".
Tomar has been facing charges that academic certificate he submitted while filing nomination for assembly polls held in February this year was fake.
"Even after this being pointed out to him (Kejriwal), why the Law Minister was made to continue? So, we demand Arvind Kejriwal should take moral responsibility, step down. The Law Minister should be sacked and seat should be vacated.
Senior Congress leader PC Chacko said that the episode was a "matter of shame" for Delhi Government.
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"The Chief Minister should ask him (Tomar) to resign or else he should be dismissed from the Government. So, I think this should not be delayed at all. It is a shame on the Government of Delhi," Chacko added.
The BJP taunted the AAP, saying the Law Minister himself has shown how law is being toyed with.
Tilak Manjhi Bhagalpur University in Bihar, where Tomar claimed to have completed his law education, told the High Court yesterday that the serial number of the provisional certificate in its record showed name of some other person and not that of Tomar.