Rejecting Singh's contention that there is a crisis of confidence in the government, the party said in a statement that 'sabka saath, sabka vikas (with all, development for all) is the government's guiding mantra.
Taking a dig at Singh, BJP said he had conveniently forgotten that as prime minister he "batted only for one family".
"But we believe in solutions and not problems, and are solving all legacy problems left by UPA. Manmohan Singh says sorry for the loss of UPA in 2014. Why is he still acting as an apologist for the Gandhi family," the BJP asked.
The party also attacked Singh for his criticism of the prime minister's Pakistan policy.
Taking a jibe at Singh, who was criticised by some during his tenure for not speaking out on important issues, BJP said, "We are absolutely delighted with the fact that he has finally found his voice in the Modi regime. We welcome him to a free India where everyone can speak what he thinks unlike the India when even he as the PM was denied his free speech.