Can the FBI Take Down Another Prez?

I was surprised last weekend when one of President Donald Trump’s lawyers told my colleague Chris Wallace twice on “Fox News Sunday” that the president is being investigated by the FBI and then told him twice that he is not. This same lawyer repeated the “not being investigated” argument on a half-dozen other Sunday shows but did not repeat the “is being investigated” remark.

This produced substantial consternation in the news media and at the White House, since the President himself had twee...