"Trump is “much more resilient” than his opponents allow, said Newt Gingrich, the former House speaker, before pivoting to a plug for his new book, Understanding Trump." (The Guardian.)
What does the expression "pivoting to a plug" mean in the sentence above?
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"Before pivoting to a plug for his new book" = "before changing the topic of conversation to an advertisement for his new book."
"pivot" is a political code word for "changing the subject to something you are more comfortable with or is more acceptable"
A "plug" is an endorsement or advertisement to buy something.