The development came as a surprise as Lakshminarayana announced last month that he will quit the party and join the YSR Congress Party (YSRCP).
The 62-year-old leader, who hails from Kapu community, had aspired for the top post but after the BJP leadership indicated that he will not be given the responsibility, he decided to switch loyalties.
He had even fixed the date to join main opposition party but postponed his move, citing ill health. BJP sources said the party's central leaders persuaded him to wait till the Assembly elections in Karnataka.
He was given the responsibility to head the BJP weeks after state's ruling Telugu Desam Party (TDP) pulled out of BJP-led NDA at the Centre over the issue of special category status to the state. Later, the BJP also pulled out of the coalition government in the state.
Lakshminarayana will have the big task of leading the party's campaign for the 2019 elections which it may have to contest alone amid criticism from rivals for going back on the promise of according special status to Andhra Pradesh.
The BJP, which fought the 2014 elections in alliance with the TDP, bagged four Assembly and two Lok Sabha seats. The coalition won 17 of the 25 Lok Sabha seats and 106 of 175 Assembly constituencies.
BJP leaders point out that the party had polled about 7 per cent votes in the 2014 Lok Sabha and over 2 per cent in the Assembly polls. They claim that the party has huge scope for improvement in vote share and seat tally.
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