Accusing Delhi Chief Minister Arvind Kejriwal of being "totally unscrupulous", friend-turned-foe Prashant Bhushan has claimed that the Aam Aadmi Party leader can even join hands with Prime Minister Narendra Modi for personal gains.

"He (Kejriwal) is totally unscrupulous.The day it suits him, he will join hands with Modi. I have no doubt about it," Bhushan, who is currently on a private visit to the US, told a small group of Indian-Americans and Indians here last night.

Bhushan's remarks come even as Kejriwal-led Delhi government and the Modi-led Centre have been at loggerheads over a range of issues over the past one year 

Bhushan, an activist-lawyer who founded Swaraj Abhiyan along with Yogendra Yadav after leaving the Aam Aadmi Party (AAP) last year, said he regrets having not "recognised" such traits of Kejriwal early on.

"He used people like me and Yogendra to gain credibility, and at the same time ensured that he enjoys majority in decision-making bodies of AAP so that he can go ahead with his agenda," he said.

Responding to a question, Bhushan alleged that Kejriwal is not interested in fighting corruption.

"He does not want accountability for himself," Bhushan said, alleging that he has been hearing a lot of corruption cases about AAP MLAs.

"Arvind has Manmohan Singh syndrome, who never took money himself but allowed others around him to take money," the former AAP leader alleged.