Telegram Global Search using the raw API function via Telethon

Question

I am trying to use the SearchGlobalRequest API method for global, full-text search on Telegram, but I am not sure what to use for some of the arguments, especially the offset_peer parameter. When I do this:

try:
    result = client(SearchGlobalRequest(
        q=search_term,
        filter=None,
        min_date=datetime.datetime.strptime(min_date, '%Y-%m-%d'),
        max_date=datetime.datetime.strptime(max_date, '%Y-%m-%d'),
        offset_rate=-1,
        # offset_peer=None,
        offset_id=-1,
        limit=10
    ))
except Exception as e:
    print(e)

I get __init__() missing 1 required positional argument: 'offset_peer'.

When I try to pass None as offset_peer, I get Cannot cast NoneType to any kind of Peer. I am not trying to search in any specific channel, I just want to specify the start and end date and find all (or rather as many as possible) matching results.

I am using Telethon version 1.24.0.