"The way he has hijacked BJP completely. The way he has sidelined senior leadership, almost virtually overnight. And a one-man or a two-man show that he is trying to run the party with self and Amit Shah, we have seen the danger in this," Chavan told PTI in an interview.
"Therefore, when a man brings in a one-man politics to BJP, the danger is that he will bring the one-man politics to (the country's) governance also," he said.
"Therefore, we have to warn the country against the dangers of the man, like how he behaved during the Gujarat riots, about how he misused police authority ostensibly for personal purpose.
"The highest organ of the police system was directed to chase and trail and snoop on an individual. This shows the disregard for norms and propriety. We can imagine the result if such a man is allowed to come to the top," he said.
"We don't know how the 'Gujarat model' will impact on the policies at the central government level and how a coalition government will be run if at all BJP gets invited to form the new government," the senior Congress leader said.
Gujarat saw more growth during the earlier Congress regime, Chavan said, adding there was need to debunk Narendra Modi's claim about the "so-called highest rate of growth" in Gujarat under his rule.