The existing law was insufficient to deal with rowdy elements attacking the migrants and there was need to enact a tough one, Singh told reporters in Lucknow.
"Definitely the law is weak and there is need to frame a harsher one," the All India Congress Committee general secretary said replying to reporters' queries.
Asserting a citizen could live anywhere in the country, he said rowdyism by MNS or Shiv Sena activists should not be tolerated at any cost.
Asked what steps the Congress-led government in Maharashtra was taking to prevent attacks on north Indians, Singh said, "Cases have been lodged against MNS and Shiv Sena workers."
"But, whatever action is to be taken it will be taken within the framework of the law," he said.
On Shiv Sena's attack on Rahul Gandhi for his comments that the National Security Guard men who vanquished terrorists during 26/11 were from Bihar and UP, Singh said those indulging in 'politics of hatred' were presenting things in a distorted manner.
"I salute the police personnel who caught Kasab and sacrificed their lives in the process," he said.
On his visit to Azamgarh tomorrow, the AICC general secretary said it was a fact-finding trip as the party had received complaints by some people that their children were being falsely implicated in terror activities.
On opposition to his visit by the Ulema Council, a Muslim body, he said nothing can stop him from going there.
Image: AICC general secretary Digvijay Singh