I think here she want's Bush to provide justification for his policies. Also possible is to "demand an explanation".

ask for answers, ask for reasons

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Note added at 17 mins (2006-12-27 20:23:23 GMT)
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demanding an answer

Human Rights in China- [ Translate this page ]昝爱宗获释，将向国家新闻出版总署讨说法, Detained reporter Zan Aizong released, plans appeal to the General Administration of Press and Publications over ...
www.hrichina.org/public/contents/30508 - 33k - Cached - Similar pages

http://www.google.co.nz/search?hl=en&q=辛迪希恩 讨说法&btnG=Search&...

'安营扎寨'讨说法 is one word, a kind of protest or demonstration



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Note added at 3 hrs (2006-12-27 23:56:01 GMT)
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This must be similar 'model' to the Tian'anmen Square protest/demonstration in 1989, the Anti-Vietnam War peaceful 'sit-ins', and the aboriginal nationalist embassy encampment outside Government House in Canberra.

Of course in imperial times, the Emperor's subjects used to travel to Beijing to petition the Emperor over injustices. Somewhat similar, but not identical, I would suggest. A different Chinese term is used (and I can't remember what it is right now...)

'petition' - you could consider using 'petition' perhaps, but it would not be understood, in the light of the other use of the term petition in the West. It might lead to confusion.

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Note added at 4 hrs (2006-12-28 00:06:44 GMT)
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petition = a request signed by a lot of people made to a government or other official group 请愿书
petition = to make a request in the form of a petition 请愿;请求
(朗文进阶词典)

I believe this is a 请求 petitioning situation. But 讨说法 goes beyond that.
哭,闹,上吊' -> this is '闹' - she is described by the media as that 'annoying mother'. it seems she is troublesome, a 'thorn in the side' of the Bush administration.

(interesting story. This Mothers against War protest movement in the States hadn't registered with me until now. I haven't been keeping up with the news recently).

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Note added at 4 hrs (2006-12-28 00:16:36 GMT)
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http://72.14.253.104/search?q=cache:HRaaJRPGEP4J:en.wikipedi...

安营扎寨讨说法 = peace camp protest; peace camp vigil in the above text.



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Note added at 4 hrs (2006-12-28 00:26:29 GMT)
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consider 'vigil'

vigil = staying awake, especially at night, in order to be with an ill person, or to express especially political disagreement, or to pray. eg Supporters of the peace movement held an all-night candlelit vigil outside the cathedral. (Cambridge Advanced Learner's Dictionary)
vigil = (常指在夜间的)监视;戒备;值夜 (朗文进阶词典)

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Note added at 4 hrs (2006-12-28 00:33:27 GMT)
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http://www.google.co.nz/search?lr=lang_zh-CN&cr=&q=安营扎寨 peac...

dear me, 安营扎寨 is not 'peace camp', it is 'to pitch a camp' -> camp (or encampment) protest/demonstation

cnn.com

Also workable: demand a meeting with the president; demand an answer on why President Bush continues to wage an unjust war on Iraq (washingtonpost.com)

Demand a hearing from the Present.