"If I fight on in my campaign, all the way to the convention, I would forestall the launch of a national campaign and make it more likely that Senator Clinton or Obama would win. And in this time of war, I simply cannot let my campaign, be a part of aiding a surrender to terror," Romney will say at the Conservative Political Action Conference in Washington.

"This is not an easy decision for me. I hate to lose. My family, my friends and our supporters... many of you right here in this room... have given a great deal to get me where I have a shot at becoming President. If this were only about me, I would go on. But I entered this race because I love America, and because I love America, I feel I must now stand aside, for our party and for our country," Romney said.

McCain prevailed in most of the Super Tuesday states, moving closer to the numbers needed to officially win the nomination.

THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.

WASHINGTON (AP)—Mitt Romney will suspend his presidential campaign for the Republican nomination, The Associated Press has learned, effectively ceding the nomination to John McCain.

"If I fight on in my campaign, all the way to the convention, I would forestall the launch of a national campaign and make it more likely that Senator Clinton or (Barack) Obama would win. And in this time of war, I simply cannot let my campaign, be a part of aiding a surrender to terror," Romney planned to say in a speech to the Conservative Political Action Conference.

"This is not an easy decision for me. I hate to lose. My family, my friends and our supporters ... many of you right here in this room ... have given a great deal to get me where I have a shot at becoming president. If this were only about me, I would go on. But I entered this race because I love America, and because I love America, I feel I must now stand aside, for our party and for our country."

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