Sen. Joe Manchin (D-W.Va.) said Sunday that a stand-alone ban on assault weapons would not win passage in Congress, and that the effort to curb mass shootings must include a broader discussion involving the entertainment industry and mental health issues.

"An assault weapons stand-alone ban on just guns alone, in the political reality we have, will not go anywhere. It has to be comprehensive," Manchin said on CNN's "State of the Union."

Manchin, a conservative Democrat who has received high marks from the NRA, said in the wake of the mass shooting at a school in Newtown, Conn., that it was time for a new discussion about regulations on assault weapons. He later wrote in a Washington Post op-ed that the problem of mass shootings must be addressed in a comprehensive manner, by looking at guns, security, the entertainment industry and mental health issues. He reiterated that view Sunday.