def _drop_command(args, hostname, port, db_name):
    """Return the dropdb command to run to backup the database.

    :param argparse.namespace args: The CLI arguments
    :param str hostname: The hostname to dump the database from
    :param int port: The port to connect on
    :param str db_name: The database to backup
    :rtype: list

    """
    return ['dropdb', '-U', args.username, '-h', hostname, '-p', str(port),
        db_name]
