Republican presidential candidate John McCain will make his seventh trip to Iraq over the Thanksgiving holiday, a campaign adviser said Monday.

The Arizona senator will be part of a small congressional delegation making the trip. Further details have not been released for security reasons, the adviser said.

McCain has made his support of the Iraq troop increase by the U.S. a central theme of his Republican presidential campaign. He had long called for sending in more troops, an idea President Bush embraced earlier this year.

McCain is a former Navy pilot and Vietnam prisoner of war.