diff --git a/mediacloud/api.py b/mediacloud/api.py
index 17b9c69..dfe6828 100644
--- a/mediacloud/api.py
+++ b/mediacloud/api.py
@@ -115,7 +115,7 @@ def _prep_default_params(self, query: str, start_date: dt.date, end_date: dt.dat
                              collection_ids: Optional[List[int]] = [], source_ids: Optional[List[int]] = [],
                              platform: Optional[str] = None):
         params: Dict[Any, Any] = dict(start=start_date.isoformat(), end=end_date.isoformat(), q=query,
-                                      platform=self.PROVIDER)
+                                      platform=(platform or self.PROVIDER))
         if len(source_ids):
             params['ss'] = ",".join([str(sid) for sid in source_ids]),
         if len(collection_ids):
@@ -140,15 +140,13 @@ def story_count_over_time(self, query: str, start_date: dt.date, end_date: dt.da
     def story_list(self, query: str, start_date: dt.date, end_date: dt.date, collection_ids: Optional[List[int]] = [],
                    source_ids: Optional[List[int]] = [], platform: Optional[str] = None,
                    expanded: Optional[bool] = None, pagination_token: Optional[str] = None,
-                   sort_field: Optional[str] = None, sort_order: Optional[str] = None,
+                   sort_order: Optional[str] = None,
                    page_size: Optional[int] = None) -> tuple[List[Dict], Optional[str]]:
         params = self._prep_default_params(query, start_date, end_date, collection_ids, source_ids, platform)
         if expanded:
             params['expanded'] = 1
         if pagination_token:
             params['pagination_token'] = pagination_token
-        if sort_field:
-            params['sort_field'] = sort_field
         if sort_order:
             params['sort_order'] = sort_order
         if page_size:
diff --git a/mediacloud/test/api_search_test.py b/mediacloud/test/api_search_test.py
index 11e396c..18618ba 100644
--- a/mediacloud/test/api_search_test.py
+++ b/mediacloud/test/api_search_test.py
@@ -6,7 +6,6 @@
 
 COLLECTION_US_NATIONAL = 34412234
 AU_BROADCAST_COMPANY = 20775
-TOMORROW = dt.date.today() + dt.timedelta(days=1)
 TOMORROW_TIME = dt.datetime.today() + dt.timedelta(days=1)
 
 
@@ -118,37 +117,19 @@ def test_story_list_sort_order(self):
         # desc
         page, _ = self._search.story_list(query="weather", start_date=self.START_DATE, end_date=self.END_DATE,
                                           collection_ids=[COLLECTION_US_NATIONAL])
-        last_pub_date = TOMORROW
+        last_date = TOMORROW_TIME
         for story in page:
-            assert 'publish_date' in story
-            assert story['publish_date'] <= last_pub_date
-            last_pub_date = story['publish_date']
+            assert 'indexed_date' in story
+            assert story['indexed_date'] <= last_date
+            last_date = story['indexed_date']
         # asc
         page, _ = self._search.story_list(query="weather", start_date=self.START_DATE, end_date=self.END_DATE,
                                           collection_ids=[COLLECTION_US_NATIONAL], sort_order='asc')
-        a_long_time_ago = dt.date(2000, 1, 1)
-        last_pub_date = a_long_time_ago
-        for story in page:
-            assert 'publish_date' in story
-            assert story['publish_date'] >= last_pub_date
-            last_pub_date = story['publish_date']
-
-    def test_story_list_sort_field(self):
-        # publish_date
-        page, _ = self._search.story_list(query="weather", start_date=self.START_DATE, end_date=self.END_DATE,
-                                          collection_ids=[COLLECTION_US_NATIONAL])
-        last_date = TOMORROW
-        for story in page:
-            assert 'publish_date' in story
-            assert story['publish_date'] <= last_date
-            last_date = story['publish_date']
-        # indexed date
-        page, _ = self._search.story_list(query="weather", start_date=self.START_DATE, end_date=self.END_DATE,
-                                          collection_ids=[COLLECTION_US_NATIONAL], sort_field="indexed_date")
-        last_date = TOMORROW_TIME
+        a_long_time_ago = dt.datetime(2000, 1, 1, 0, 0, 0)
+        last_date = a_long_time_ago
         for story in page:
             assert 'indexed_date' in story
-            assert story['indexed_date'] <= last_date
+            assert story['indexed_date'] >= last_date
             last_date = story['indexed_date']
 
     def test_search_by_indexed_date(self):