Ed Henry reported this morning (video above) that President Obama is preparing an address to the nation Wednesday that will outline the strategy to destroy ISIS. He said the president will meet Tuesday with lawmakers and with his national security team.

The New York Times reports that the White House plan involves three phases that some Pentagon officials believe will require at least three years of sustained effort.

The first phase, airstrikes against ISIS, is already under way in Iraq, where U.S. aircraft have launched 143 attacks since August 8. The second phase involves an intensified effort to train, advise, and equip the Iraqi Army, Kurdish Peshmerga fighters, and any Sunni tribesmen willing to fight their ISIS co-religionists.

The Times reports that this second phase will begin sometime after Iraq forms a new government, which could happen this week. 

The third, and most politically fraught phase of the campaign, according to The Times, would require airstrikes against ISIS inside Syria. Last month, the government of Bashar Assad in Damascus warned the Obama administration not to launch airstrikes against ISIS in Syria without its permission. 

A senior Obama administration official told Fox News imminent, new military action in either Iraq or Syria was not expected to be announced in Wednesday's speech. A senior White House official told Fox News that Obama's primary aim will be to update the American public on what the strategy is to deal with the militant group, saying the administration wants "people to understand how he's approaching this."

Brit Hume assessed the new developments this morning with Martha MacCallum, arguing there's no doubt that the president did not want any new military action in Iraq.

"Now circumstances have become such that he's had to do it because the politics of the issue have changed. So we'll see how far he's willing to go," said Hume, pointing out that the big questions are still about U.S. combat troops on the ground and U.S. strikes in Syria.

Hume asked what will happen if it's determined that U.S. ground troops are required against ISIS, and argued that President Obama would rather his successor have to deal with that issue.

Watch the discussion below: