Fargo, July 4: Democratic presidential candidate Barack Obama waded into controversy on Thursday over his plans to withdraw US combat troops from Iraq, first saying he might “refine” his views but later declaring his stance had remained unchanged for more than a year.

Obama was forced to call reporters back for a second news conference in Fargo, North Dakota, after he initially left open the possibility of revising his 16-month timetable for pulling US combat forces from Iraq.

“Let me be as clear as I can be. I intend to end this war. My first day in office I will bring the joint chiefs of staff in and I will give them a new mission and that is to end this war,” Obama told reporters in his second news conference.

But he added: “I would be a poor commander in chief if I didn’t take facts on the ground into account.”

At an earlier news conference, the Illinois senator had said he could “refine” his stance after he visits Iraq.

Obama, an early opponent of the war who made his stance a centerpiece of his Democratic presidential campaign, said he would not support a long-term US presence in Iraq but wanted to ensure any troop withdrawal was orderly and safe.

“I’ve always said I would listen to commanders on the ground. I’ve always said the pace of withdrawal would be dictated by the safety and security of our troops and the need to maintain stability,” he told reporters on arrival in North Dakota.

“That assessment has not changed, and when I have a chance to meet with some of the commanders on the ground I’m sure I’ll have more information and will continue to refine my policies.”

After heavy criticism from his Republican presidential opponent John McCain, Obama said he would visit Iraq and Afghanistan later this summer. It will be his second visit to Iraq.

McCain, an Arizona senator, is a staunch advocate of the current US strategy in Iraq and the issue is certain to be central to their November election battle for the White House.

Obama said McCain’s campaign had “primed the pump” to convince reporters he was going to change his position. McCain’s campaign has inundated reporters with e-mails suggesting Obama was prepared to shift his stance.

Republicans quickly pounced on his initial comments.

“There appears to be no issue that Barack Obama is not willing to reverse himself on for the sake of political expedience,” said Alex Conant, a Republican National Committee spokesman.

Obama said his plan for withdrawing one or two combat brigades a month from Iraq after he takes office always depended on conditions on the ground.