The United States appeared to have entered into a national debate on the proposal by Amazon CEO to use drones to deliver its packages to homes after a top legislator has raised concerns about privacy protection of American public for such a move.

"Before drones start delivering packages, we need the FAA to deliver privacy protections for the American public," US Senator, Ed Markey, said in a statement.

"Convenience should never trump constitutional protections. Before our skies teem with commercial drones, clear rules must be set that protect the privacy and safety of the public," he added.

The Federal Aviation Administration is scheduled to issue a ruling on the impact of increased use of commercial drones on the US airline industry by 2015.