The 10-member team, led by party member Sanjay Singh, expressed disappointment over "collapse" of law and order machinery in the country, particularly in Uttar Pradesh.
Singh accused the police of trying to cover up such incidents by not properly pursuing the cases, thus helping offenders to get off the hook.
Assuring every possible assistance to Mehwish, he said the team will put pressure on the state and Central governments to ensure that Hakim's widow gets justice.
Mehwish and Hakim had appeared in Bollywood actor Aamir Khan's show Satyamev Jayate, where the couple had spoken about the threat to them from her family members for getting married against their wishes.