And for a second day, so Mrs. Clinton did, repeatedly calling on Pakistan’s government to shut down safe havens from which extremists have mounted attacks in Afghanistan and to support nascent efforts to negotiate with those extremists willing to lay down their arms.
The delegation, officials said, bluntly warned Pakistan that it faced a decisive choice between fighting alongside the United States — or watching as American forces act alone against the extremist Haqqani network, even inside Pakistan, if necessary. On Friday, Mrs. Clinton said that “for too long” the group had been able to operate freely.



