This infuriates me as a Twitter stockholder and user. Has everyone at Twitter fallen asleep? How could they not have the jump on Google on this.
I'd argue further that Twitter has done close to nothing to make their search a useful feature in the first place, which is why people aren't searching Twitter with "Donald Trump". If I was Twitter, this would be very worrying. All they've managed to do so far is "firehose search", which is only useful for realtime events unfolding. They probably should have been thinking about "topic search" and "person search" for a while now...
FTFY
This is a big deal because Google is leveraging their dominant position in search to coerce people into using it as a social platform.