"SP, BSP and Congress, which used to abuse each other are hand in gloves in looting the country...the country cannot be safe, if they existed. Despite price rise and corruption both SP and BSP are supporting Congress at the centre," Singh said at a rally here.
Taking potshots at the Samjwadi Party government in UP, Singh said people had given them majority and had expectations, but they are disheartened now.
"There is no law and order in the state...women are not safe...police becomes active when buffalo of a minister goes missing but nothing is done when a child is not found," he said.
In a reference to repeated violation of the Indian border by Pakistan and China and the death of two naval officers in INS Sindhuratana submarine mishap, Singh alleged that the UPA government was toying with the security of the country.
He appealed to the people to form majority government led by Modi at the Centre and said that once BJP led NDA came to power, lapses in national security would be rectified and concrete measures would be taken to provide high quality weapons and equipments to the defence services.
Highlighting increasing popularity of party's PM candidate Narendra Modi, he said that the number of political attacks made on the Gujarat CM were never made on any other person in the history.
The party president also welcomed former UP CM Kalyan Singh back in the party. Singh announced that an important responsibility would be given to Kalyan in the BJP soon.
Earlier, addressing the rally Kalyan targeted the third front formed by 11 parties, including SP and left parties and said that it was not a "third front", but a "failed front".
Taking names of AAP leader Arvind Kejariwal, SP supremo Mulayam and BSP chief Mayawati, he said that it was a season to dream and these people were "dreaming to become the next PM".
He said people have decided to make Modi the next PM and it would be a reality in the next 80 days.
Former army chief General V K Singh and Udit Raj also addressed the crowd at rally.