GPP, formed by former Chief Minister Keshubhai Patel a few months prior to the state Assembly elections held in December last year, had won two seats in the polls.
Keshubhai won the Visavadar seat and Nalin Kotadiya emerged as the winner on Dhari Assembly seat.
"At a time, when everyone is wanting Gujarat Chief Minister Narendra Modi to become the Prime Minister on the bank of his development work in the state, I'm impressed with the progress of the state under his rule," Kotadiya told PTI.
Regarding his decision to join BJP, he said, "I have been invited by Modi to join the party but will discuss with his supporters before finalising a decision."
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Kotadiya said that he joined GPP, expecting the newly-formed party to win at least 20-25 seats but now the entire political scenario has changed and the state government, under Modi, is ensuring development.
GPP, which had been formed with the sole aim to defeat the Modi-led BJP in the Assembly polls, proved to be a non-starter as it managed to win just two seats in spite of fielding candidates in almost all 182 state constituencies.
By-polls to two Lok Sabha constituencies - Porbandar and Banaskantha - and four Assembly seats - Limbdi, Jetpur, Dhoraji and Morva Hadaf - will take place on June 2. Votes will be counted on June 5.