def fetch_issues(session, repo):
    """Fetch list of issues for the repository
    
    Args:
        session (Session): Request's session
        repo (tuple): (repository_owner, repository_name) 
    Returns:
        dict: JSON Response
    """
    repo_owner, repo_name = repo
    r = session.get("https://api.github.com/repos/{}/{}/issues".format(
        repo_owner, repo_name)
    )
    r.raise_for_status
    return r.json()