Google deprecated the old RSS feed URL format December 1st 2017 (deprecation notice), in addition to that they dropped the button in the Google News interface to generate a
Requests to the Geo endpoint seem to be working again.
e.g. https://news.google.com/news/rss/headlines/section/geo/{place_name}
https://news.google.com/news/rss/headlines/section/geo/{place_name}
Also, if you use the non-geo search, you can specify a 7-day window by adding +when:7d to your search.
+when:7d
e.g. https://news.google.com/rss/search?q={key_words}+when:7d
https://news.google.com/rss/search?q={key_words}+when:7d