BJP's Delhi unit also said Garg's claims affirmed BJP's stand that Kejriwal is a "manipulator".
The ex-AAP legislator from Rohini, whom the party had recently suspended, had earlier alleged that calls with Kejriwal's "consent" were made to him and several other AAP leaders offering them crores to support BJP during the previous phase of government formation.
Garg also claimed that other AAP leaders too had received calls with similar offers.
BJP said the issue needs thorough investigation as it concerns the names of Union Ministers.
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"The latest revelation made by Garg needs to be thoroughly investigated. The revelations testify stand taken by BJP for long that Kejriwal is a master planner and manipulator.
It is a matter of concern that names of senior Union Ministers were misused by Kejriwal and his associate to play dirty politics," Delhi BJP president Satish Upadhyay said.
He added the BJP is planning to take up the matter legally and further said, following Garg's revelation, there is a reason to believe that most of the incidents like the one in which Kejriwal was slapped during campaign, were all "stage-managed" aimed at gathering sympathy.
His comments assume significance as a rickshaw driver had slapped the AAP convener during an election rally held in Delhi's Sultanpuri area in April last year.