diff --git a/github/client.py b/github/client.py
index cf0efe9..868147d 100644
--- a/github/client.py
+++ b/github/client.py
@@ -74,14 +74,14 @@ class GHClient:
 
         if username and token:
             self.username = username
-            self.token = token
-            self._auth = aiohttp.BasicAuth(username, token)
+            self.__token = token
+            self.__auth = aiohttp.BasicAuth(username, token)
         else:
-            self._auth = None
+            self.__auth = None
             self.username = None
-            self.token = None
+            self.__token = None
 
-        self.http = http(headers=custom_headers, auth=self._auth)
+        self.http = http(headers=custom_headers, auth=self.__auth)
 
         self._user_cache = ObjectCache[Any, User](user_cache_size)
         self._repo_cache = ObjectCache[Any, Repository](repo_cache_size)
@@ -109,7 +109,7 @@ class GHClient:
             raise Exception('HTTP Session doesn\'t exist') from exc
 
     def __repr__(self) -> str:
-        return f'<{self.__class__.__name__} has_auth={bool(self._auth)}>'
+        return f'<{self.__class__.__name__} has_auth={bool(self.__auth)}>'
 
     @overload
     def check_limits(self, as_dict: Literal[True] = True) -> Dict[str, Union[str, int]]:
@@ -167,8 +167,8 @@ class GHClient:
         """
         if self.has_started:
             raise exceptions.AlreadyStarted
-        if self._auth:
-            self.http = await http(auth=self._auth, headers=self._headers)
+        if self.__auth:
+            self.http = await http(auth=self.__auth, headers=self._headers)
             try:
                 await self.http.get_self()
             except exceptions.InvalidToken as exc:
@@ -213,7 +213,7 @@ class GHClient:
     # @_cache(type='User')
     async def get_self(self) -> User:
         """:class:`User`: Returns the authenticated User object."""
-        if self._auth:
+        if self.__auth:
             return User(await self.http.get_self(), self.http)
         else:
             raise exceptions.NoAuthProvided
diff --git a/github/exceptions.py b/github/exceptions.py
index 2399812..cf5dc0c 100644
--- a/github/exceptions.py
+++ b/github/exceptions.py
@@ -93,8 +93,8 @@ class InvalidToken(ClientException):
 class InvalidAuthCombination(ClientException):
     """Raised when the username and token are both provided."""
 
-    def __init__(self):
-        msg = 'The username and token cannot be used together.'
+    def __init__(self, msg: str):
+        #msg = 'The username and token cannot be used together.'
         super().__init__(msg)
 
 
diff --git a/github/objects.py b/github/objects.py
index 9d2fcb2..2079ed1 100644
--- a/github/objects.py
+++ b/github/objects.py
@@ -253,6 +253,10 @@ class Repository(APIObject):
     def forks(self) -> int:
         return self._response.get('forks')
 
+    async def delete(self) -> None:
+        """Deletes the repository."""
+        return await self._http.delete_repo(self.owner.name, self.name,) #type: ignore
+
 
 class Issue(APIObject):
     """Representation of an issue on Github.