AFP:  White House talks, to avert a disastrous early August debt default, teetered on the edge of collapse late Friday, as Republican House Speaker John Boehner abruptly quit the negotiations.  US President Barack Obama condemned Boehner's decision and angrily called top lawmakers to the White House for emergency negotiations at 11 am (1500 GMT) Saturday, warning, "We have run out of time" with an August deadline looming.  "I expect them to have an answer in terms of how they intend to get t...

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