Probably because this is an obviously hot political topic, not new, and something that will indeed be sufficiently mainstream to be (heavily) covered in the usual news channels. Whereas the guidelines explicitly state:
> "Off-Topic: Most stories about politics [...] unless they're evidence of some interesting new phenomenon. [...] If they'd cover it on TV news, it's probably off-topic."
This story will just attract the usual partisan posturing and is very unlikely to bring any really interesting high value conversations.