Netanyahu is warning, indeed threatening, that if we do not set a date for Iran to end enrichment of uranium, Israel will bomb Iran and start the war itself.

What is Bibi Netanyahu up to?

With all his warnings of Iran’s “nuclear capability,” of red lines being crossed, of “breakout,” of the international community failing in its duty, of an “existential threat” to Israel, what is the prime minister’s game?

The answer is apparent. Bibi wants Iran’s nuclear program shut down, all enrichment ended, all enriched uranium removed and guarantees that Iran will never again start up a nuclear program.

And if Tehran refuses to surrender its right even to a peaceful nuclear program, he wants its nuclear facilities, especially the enrichment facility at Fordow, deep inside a mountain, obliterated.

And he wants us to do it.

How has Bibi gone about getting America to fight Israel’s war?

He is warning, indeed threatening, that if we do not set a date certain for Iran to end enrichment of uranium, and assure Israel that we will attack Iran if it rejects our ultimatum, Israel will bomb Iran and start the war itself.

Fail to give us assurances that you will attack Iran if Iran refuses to surrender its nuclear “capability,” Bibi is warning, and we will attack Iran, with all the consequences that will have for you, for us and for the Middle East.

This is diplomatic extortion.

Thus far, Obama has called Bibi’s bluff, assuming it is a bluff.

The United States has refused to set a date certain by which Iran must end all enrichment. Hillary Clinton said this weekend that we are “not setting deadlines.” And the election, which could give Obama a free hand to pursue his own timetable and terms for a deal with Tehran, is only eight weeks off.

If Obama, no fan of Bibi, wins, he can tell Bibi: We oppose any Israeli pre-emptive strike. If you attack Iran, we will not support you. Nor will we follow up an Israeli attack with an American attack.

Bibi’s dilemma: Despite his threats of Israeli strikes on Iran, Tehran is taunting him. His Cabinet is divided. The Shas Party in his coalition opposes a war, as do respected retired generals, former Mossad leaders and President Shimon Peres.

And the Americans have sent emissaries, including Secretary Leon Panetta, to tell Bibi we oppose an Israeli attack. The Pentagon does not want war. Three former U.S. Central Command heads oppose a war. And last week, Chairman of the Joint Chiefs Gen. Martin Dempsey said he does not wish to be “complicit” in any Israeli attack.

Implied in the word “complicit” is that Dempsey believes an Israeli first strike on Iran could be an act of aggression.

The Israelis were furious, but suddenly the war talk subsided.

From the clashes, public and private, between these two close allies, it is apparent the United States shares neither Israel’s assessment of the threat nor Israel’s sense of urgency.

Why not? Why, when Netanyahu says Israel is facing an “existential threat,” do the Americans dismiss it?

The first reason is the elephant in the room no one mentions: Israel’s own nuclear arsenal. If Fordow is a difficult target for Israel to destroy with conventional air strikes, it could be annihilated with a single atom bomb.

And Israel has hundreds.

Indeed, if Israel has ruled out use of an atomic weapon, even when it says its very existence is threatened, and neoconservatives claim that Iran’s mullahs are such death-wishing fanatics they cannot be deterred even by nuclear weapons, what is Israel’s awesome atomic arsenal for?

What this suggests is that the Israelis do not believe what they are saying. Their nuclear deterrent is highly credible to all their neighbors. Their existence is not in imminent peril. And the mullahs are not madmen.

When Ronald Reagan was about to take the oath, suddenly those mullahs, assessing that the new American president might be a man of action, not just words, had all the U.S. hostages winging their way home.

When the USS Vincennes mistakenly shot down an Iranian airliner in 1988, the Ayatollah Khomeini, founding father of the Islamic Republic, ended his war with Iraq on unfavorable terms, fearing America was about to intervene on the side of Saddam Hussein.

Like all rulers, good and evil, Iran’s leaders want to preserve what they have — families, homes, lives, privileges, possessions, power. When suicide missions are ordered, you do not read of ayatollahs or of Iranian politicians driving the truck or wearing the vest.

Moreover, the latest report of the international inspectors reveals that while Iran increased its supply of uranium enriched to 20 percent since last spring, an even larger share of that 20-percent uranium has been diverted to make fuel plates for Iran’s U.S.-provided research reactor to make medical isotopes.

If there is no reason to go to war with Iran, there is every reason not to go to war. Notwithstanding the alarmist rhetoric of Bibi and Ehud Barak, President Obama should stand his ground. And on this one, Gov. Romney should stand with the president, not the prime minister.