Is US in constitutional crisis? That may not be most important question.

Whether you call it a constitutional crisis or a partisan impasse, the current deadlock between the White House and Congress is not something envisioned by the Founders. And it may only be resolved at the ballot box.

President Donald Trump’s pledge of non-cooperation with the impeachment inquiry of the Democratic-controlled House of Representatives may or may not be a “constitutional crisis.” But it is a stark new test of the nation’s founding legal document – perhaps the most important such trial since Richard Nixon declined to turn over the White...