Sentence:  The question was probably bottomed on a combination of phrases in a Washington Post <WSD>op-ed</WSD> article that appeared not three months before by Richard Haass, who was a foreign-policy adviser in both Bush administrations and is now president of the Council on Foreign Relations. 
Meaning of the word marked with <WSD> tags:  Of or being a newspaper page, usually opposite the editorial page, that features signed articles expressing personal viewpoints.