Donald Trump is new to this. But not as new as he was nearly 100 days ago.

Inexperience and novelty have been defining characteristics of President Trump’s first three months in office, both for better and for worse. He has made rookie mistakes and proven malleable, even credulous to bad arguments. But, to good effect, his flexibility has dragged him away from some bad ideas, and there are signs that his could be a sharply pragmatic administration.