Neither any political party nor any leader would trust Kumar any longer, he added.
"The way he (Kumar) has taken a U-turn by severing his ties with the Grand Alliance and subsequently aligning with the NDA, neither any political party nor any leader would trust him anymore," Anwar told reporters at the Nationalist Congress Party (NCP) office here.
Everyone would now try to "use" him to the extent possible, he said, adding that he did not see Kumar's political future as very bright.
On how long the JD(U)-BJP alliance would run, given the record of Kumar snapping ties with the BJP and again holding its hands, Anwar said even Prime Minister Narendra Modi and the National Democratic Alliance (NDA) would not trust him.
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To a query on Kumar's chances of finding a place in the opposition camp, in case he was dumped by the NDA, he said, "I don't think Nitish Kumar can make a comeback into the opposition-fold. The opposition will not trust him."
"It is good that the people got to know the real face of Nitish Kumar much before the 2019 Lok Sabha polls," he said, adding that had the JD(U) leader decided to switch sides in the last minute, it would have been a more difficult situation for the opposition.
The opposition parties would unite once again, said Anwar, adding that he met RJD chief Lalu Prasad and discussed the future course of politics with him.
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