The "lotus (BJP's poll symbol) is blooming all over the country," Singh told reporters while replying to a query whether the "lotus is sinking" in Karnataka, the first ever southern state where the party grabbed power five years ago.
Singh, on a two-day campaign tour since yesterday for the May 5 assembly polls, said there were no differences within the party.
He said former party strongman B S Yeddyurappa, who has floated Karnataka Janatha Party after his exit from BJP, could have been reinstated as chief minister "if and when" he came clean in corruption cases against him.
Singh said the UPA Government had 'failed' on all fronts -- economic, internal and external security, diplomatic and strategic. The government has lost its control on price rise and inflation, he said.
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Speaking on external security, he said China was 'encircling' India and had made incursions into the country's border but the UPA Government was not taking any action.
He said a decision would be taken at an "appropriate time" on the issue of prime ministerial candidate.