Barack Obama may be making major news this morning with a big speech on Iraq in Washington, D.C., and excerpts from the speech have just been released by his campaign.

The speech will be closely watched at least in part what he says about his proposed 16-month timetable. The just-released excerpts contain no mention of the specific timetable, so we'll have to wait until he delivers the speech to see what -- if anything -- he intends to say about it.

In the excerpts, however, Obama does re-commit himself to a broader foreign policy vision that is a clean break with that of George Bush and John McCain, both of whom say they see an extended presence in Iraq as central to American national security. Obama, by contrast, argues in the speech that this extended presence is harmful to our security and endangers our future in multiple ways. At the same time, he presses his case for more aggressive engagement in Afghanistan. Key excerpt:

This war diminishes our security, our standing in the world, our military, our economy, and the resources that we need to confront the challenges of the 21st century. By any measure, our single-minded and open-ended focus on Iraq is not a sound strategy for keeping America safe...

"As President, I will pursue a tough, smart and principled national security strategy - one that recognizes that we have interests not just in Baghdad, but in Kandahar and Karachi, in Tokyo and London, in Beijing and Berlin. I will focus this strategy on five goals essential to making America safer: ending the war in Iraq responsibly; finishing the fight against al Qaeda and the Taliban; securing all nuclear weapons and materials from terrorists and rogue states; achieving true energy security; and rebuilding our alliances to meet the challenges of the 21st century."

Full excerpts after the jump.

Late Update: I should reiterate that Obama did re-commit himself to the 16-month timetable in his New York Times Op ed yesterday.

"Our men and women in uniform have accomplished every mission we have given them. What's missing in our debate about Iraq - what has been missing since before the war began - is a discussion of the strategic consequences of Iraq and its dominance of our foreign policy. This war distracts us from every threat that we face and so many opportunities we could seize. This war diminishes our security, our standing in the world, our military, our economy, and the resources that we need to confront the challenges of the 21st century. By any measure, our single-minded and open-ended focus on Iraq is not a sound strategy for keeping America safe.

"I am running for President of the United States to lead this country in a new direction -to seize this moment's promise. Instead of being distracted from the most pressing threats that we face, I want to overcome them. Instead of pushing the entire burden of our foreign policy on to the brave men and women of our military, I want to use all elements of American power to keep us safe, and prosperous, and free. Instead of alienating ourselves from the world, I want America - once again - to lead.

"As President, I will pursue a tough, smart and principled national security strategy - one that recognizes that we have interests not just in Baghdad, but in Kandahar and Karachi, in Tokyo and London, in Beijing and Berlin. I will focus this strategy on five goals essential to making America safer: ending the war in Iraq responsibly; finishing the fight against al Qaeda and the Taliban; securing all nuclear weapons and materials from terrorists and rogue states; achieving true energy security; and rebuilding our alliances to meet the challenges of the 21st century."

***

"In fact - as should have been apparent to President Bush and Senator McCain - the central front in the war on terror is not Iraq, and it never was. That's why the second goal of my new strategy will be taking the fight to al Qaeda in Afghanistan and Pakistan.

"It is unacceptable that almost seven years after nearly 3,000 Americans were killed on our soil, the terrorists who attacked us on 9/11 are still at large. Osama bin Laden and Ayman al-Zawahari are recording messages to their followers and plotting more terror. The Taliban controls parts of Afghanistan. Al Qaeda has an expanding base in Pakistan that is probably no farther from their old Afghan sanctuary than a train ride from Washington to Philadelphia. If another attack on our homeland comes, it will likely come from the same region where 9/11 was planned. And yet today, we have five times more troops in Iraq than Afghanistan.

"Senator McCain said - just months ago - that 'Afghanistan is not in trouble because of our diversion to Iraq.' I could not disagree more. Our troops and our NATO allies are performing heroically in Afghanistan, but I have argued for years that we lack the resources to finish the job because of our commitment to Iraq. That's what the Chairman of the Joint Chiefs of Staff said earlier this month. And that's why, as President, I will make the fight against al Qaeda and the Taliban the top priority that it should be. This is a war that we have to win."

***

"Make no mistake: we can't succeed in Afghanistan or secure our homeland unless we change our Pakistan policy. We must expect more of the Pakistani government, but we must offer more than a blank check to a General who has lost the confidence of his people. It's time to strengthen stability by standing up for the aspirations of the Pakistani people. That's why I'm cosponsoring a bill with Joe Biden and Richard Lugar to triple non-military aid to the Pakistani people and to sustain it for a decade, while ensuring that the military assistance we do provide is used to take the fight to the Taliban and al Qaeda. We must move beyond a purely military alliance built on convenience, or face mounting popular opposition in a nuclear-armed nation at the nexus of terror and radical Islam."