I read the following sentence from the NYT, and am not sure how this structure works, grammatically or idiomatically:
The angriest Obama became with Clinton, Landler says, concerned the Arab Spring and the uprising in Egypt’s Tahrir Square.
I guess it supposed to be "The angriest Obama became with Clinton when the issue was concerned with the Arab Spring and the uprising in Egypt's Tahrir."
With the original sentence, I am confused exactly what is being modified by "concerned." And I am not sure if "concerned" is a proper way to say instead of "concerned with (the subject)."
I already asked the same question on wordreference.com, but I would like to get more help if possible.(http://forum.wordreference.com/threads/the-angriest-someone-became-with-someone-concerned.3178342/#post-16083750)
Thank you in advance:)