The U.S. has said it is willing to introduce a resolution at the UN Security Council to authorize such a force.
"We will be doing everything that we can to support that process and ensure swift passage of that resolution," Feinstein said.
She said the U.S. would seek contributions such as personnel, equipment, training, financing or other support from countries across the world.
Recommendations from an Aug. 15 UN report are likely to shape what the force would look like, she said.
Haiti's government requested international security assistance last year and the UN has repeatedly voiced its support for a security force.
Persons:
Ralph Tedy Erol, Haiti Barbara Feinstein, Feinstein, Haiti's, Sarah Morland, Grant McCool
Organizations:
Haitian National Police, U.S . Embassy, REUTERS, UN, State Department, State, Caribbean Affairs, UN Security Council, Thomson
Locations:
Port, Prince, Haiti, Kenya, United States, Haitian, U.S, Ouest