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Following an exclusive appearance on CBS News' political webcast "Washington Unplugged," President Jimmy Carter was at the White House Tuesday for a meeting with national security advisor Tom Donilon.

White House press secretary Robert Gibbs told reporters in his daily briefing President Obama asked the former president to stop by.

Mr. Carter further discussed his foreign policy experience, detailed in his newest book "White House Diary," with CBS News White House correspondent Bill Plante on Monday.

Regarding Iran, Mr. Carter said he did not think sanctions against a nuclear program would be successful. "The decision about whether or not to become a nuclear power will be made by Iranians," Mr. Carter said. "Outside sanctions will have very little affect on them."

Mr. Carter went on to say that sanctions may have the opposite affect. "That [sanctions] would be one factor in going with nuclear weapons."

Classified documents released this week by Wikileaks revealed Arab allies have encouraged the United States to use force against Iran and its nuclear program, which does not surprise Mr. Carter.