Is Trump in Trouble?

The bad news for President Donald Trump keeps coming his way, notwithstanding a generally bravura performance on the foreign stage this past week in Riyadh, Jerusalem and Vatican City. Yet while he was overseas, his colleagues here in the United States have been advising him to hire criminal defense counsel, and he has apparently begun that process. Can the president be charged with obstructing justice when he asks that federal investigations of his friends be shut down?

Most legal scholars a...