Did Obama interfere with US-Iraq negotiations?

The Washington Times has this:

Some of the specifics of the conversations remain the subject of dispute. Iraqi leaders purported to The Times that Mr. Obama urged Baghdad to delay an agreement with Mr. Bush until next year when a new president will be in office - a charge the Democratic campaign denies.

Mr. Obama spoke June 16 to Foreign Minister Hoshyar Zebari when he was in Washington, according to both the Iraqi Embassy in Washington and the Obama campaign. Both said the conversation was at Mr. Zebari's request and took place on the phone because Mr. Obama was traveling.

However, the two sides differ over what Mr. Obama said.

"In the conversation, the senator urged Iraq to delay the [memorandum of understanding] between Iraq and the United States until the new administration was in place," said Samir Sumaidaie, Iraq's ambassador to the United States. . . .