"Jab bolna hoga, tab bolenge...Vo jante hain (when required, he (PM) will speak...He knows it," Madhav said.
"When to speak, when not to speak would not be decided by Opposition. We will decide it. We will not speak when you ask," he said.
Madhav was addressing a special session at Indian Youth Parliament organised by 'Yuva Morcha' here.
The grand alliance of Bihar, comprising JD(U), RJD and Congress, today approached the Election Commission seeking suspension of Prime Minister's 'Mann Ki Baat' programme till the state polls are over, raising doubts he might use it to influence voters.
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Madhav also denied charges that the ruling party was following schemes of the previous UPA dispensation.
"If people have voted a party (BJP) to power, then it would run the government on new policies. This is not at all essential to run old schemes.
"If the party in power has to run the old schemes of the previous government (which has lost the majority), then why people voted it," he asked.
The BJP leader also slammed opposition parties for disrupting Parliament.
"Walkout in Parliament or Assembly is not just to go out, have a lunch and sit at home. This is not democracy...
On youths' participation in politics, Madhav said the youth should enter from local politics, and do not go for 'lal batti gari' (red beacon) right from beginning of their political inning.
"Try to make India great, and Modi government has strengthened foreign policy and diplomacy not only with foreign nations but also with Indians living abroad and doing their jobs," he said.