Charles Krauthammer recommends in his latest column that congressional Republicans call President Obama’s bluff on the upcoming spending sequester.

For the first time since Election Day, President Obama is on the defensive. That’s because on March 1, automatic spending cuts (“sequestration”) go into effect — $1.2 trillion over ten years, half from domestic (discretionary) programs, half from defense.

The idea had been proposed and promoted by the White House during the July 2011 debt-ceiling negotiations. The political calculation was that such draconian defense cuts would drive the GOP to offer concessions.

It backfired. The Republicans have offered no concessions. Obama’s bluff is being called and he’s the desperate party. He abhors the domestic cuts. And as commander-in-chief he must worry about indiscriminate Pentagon cuts that his own defense secretary calls catastrophic.

So Tuesday, Obama urgently called on Congress to head off the sequester with a short-term fix. But instead of offering an alternative $1.2 trillion in cuts, Obama demanded a “balanced approach,” coupling any cuts with new tax increases.

What should the Republicans do? Nothing.

Republicans should explain — message No. 1 — that in the fiscal-cliff deal the president already got major tax hikes with no corresponding spending cuts. Now it is time for a nation $16 trillion in debt to cut spending. That’s balance.