He also accused his former alliance partner NCP of having a pre-meditated plan to topple the state government.
"After the NCP pulled out of the government, the Governor (Vidyasagar Rao) first asked me to continue as the caretaker CM. Later, a cabinet meet was held and the President was forced to sign on the file on a Sunday, invoking his rule in the state. He didn't even get time to seek legal opinion," Chavan told PTI in an interview.
"I was surprised when they (NCP) asked us to share the CM's post. I knew after this, the alliance will eventually break. This was their gameplan...Hand over the state to the BJP (by pulling out of the government) and in return get a ministerial berth at the Centre," he said.
On clean chit to Ajit Pawar in the alleged multi-crore irrigation scam, Chavan said that law will eventually catch up with the NCP leader as it did with former Tamil Nadu Chief Minister Jayalalithaa, who has been awarded a four-year jail term in the illegal assets case.
He said the first thing post elections, if voted to power, will be to do away with corrupt practices.
"I was sent to Maharashtra to clean up the existing system. I tried to do that even though all were against me. A coalition government did not let me do my job completely. But if we get a majority now, my first priority will be to ensure that no minister is a state co-operative Chairman," he said.