The BJP's former ally also took a jibe at Modi, noting that one does not need a "56-inch chest" to protect the country's interests but a strong will power even as the Opposition parties including the Congress said government's response was "found wanting".
Congress Vice President Rahul Gandhi led the party charge in taking on Modi, saying he has done nothing to stop the continued shelling and firing by Pakistani troops in Jammu and Kashmir despite "many provocations".
In its editorial mouthpiece 'Saamna', the Sena claimed that Pakistan has been emboldened by government's failure to take "firm" steps against the cross-border firing and shelling.
Keeping Modi busy in election rallies across the state while he is most needed at the Centre is like undermining the national security of India, it said.
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"Do you need a 56-inch chest to protect the interests of the nation and to teach Pakistan a lesson for their misdeeds? All you need is a strong will power to give it back to them in the same measure," it said.
"Pakistan is daring to continuously fire on the Indian side because there are no firm steps taken by the Indian government," Sena said.
Samajwadi Party general secretary Naresh Agrawal also took a swipe at Modi and BJP.
"Those whom we considered strong turned out to be weak. Those whom we gave full power, failed to utilise it. We are not able to counter the manner in which a small country like Pakistan is threatening India and engaged in regular firing in our territory.
"We are behaving like cowards and are only giving false threats. Nobody expected this from the Government. The Government has disappointed the nation. Had there been the leadership of Mulayam Singh Yadav in the country, Pakistan would have been given a befitting reply," Agrawal said.