(CNN) - Sen. John McCain's campaign said Sunday that Barack Obama's remarks on Iraq "have left a significant question as to exactly what he intends."
"He has held almost every conceivable position in the course of his relatively brief career in the Senate," said Randy Scheunemann, McCain's foreign policy adviser.
Obama maintains his stance has not changed and said Saturday that "every single word" he says is closely measured.
McCain's campaign suggested Obama's views could be becoming more in line with McCain's Iraq policy.
"The position of [McCain's] campaign is that words do matter, and Sen. Obama's words have left a significant question as to exactly what he intends. If he is now joining Sen. McCain's position and saying that the need to maintain peace and stability in Iraq is a prerequisite before responsible withdrawal, which is Sen. McCain's position, we welcome his conversion to that position," Scheunemann said Sunday in a conference call with reporters.
The war over words started Thursday when Obama told reporters questioning his stance on Iraq that he will "continue to refine" his policies as warranted.
Obama denied any suggestion that he was shying away from his proposed 16-month phased withdrawal of all combat troops from Iraq, calling it "pure speculation" and adding that his "position has not changed."
National reporters and Republicans pounced on his comments. The Republican National Committee put out an e-mail statement saying that Obama was backing away from his position on withdrawal.