MoveOn.org is seeking donations for a new advertisement in which it criticizes John McCainJohn Sidney McCainEx-Rep. Scott Taylor to seek old Virginia seat Man acquitted over tweet offering 0 to killing an ICE agent Lessons of the Kamala Harris campaign MORE for not supporting a timetable for the withdrawal of U.S. troops from Iraq.

"John McCain doesn't want a timetable," a narrator says in the ad. "He'll spend hundreds of billions of dollars more to keep our troops in Iraq for years and years."

The narrator adds that Americans and Iraqis, including Iraqi Prime Minister Nouri al-Maliki, have expressed support for a withdrawal schedule.

The Republican National Committee responded to the advertisement by saying that the liberal group and its presidential candidate, Barack ObamaBarack Hussein ObamaThe mullahs seek to control uncontrolled chaos Poll: Majority of Democrats thinks Obama was better president than Washington Obama urges Americans to get health coverage in new holiday video MORE, have been wrong to oppose the U.S. military surge.

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