s.liance, but tonight that relationship is on shaky ground following egypt s decision to try 19 americans on unspecified charges. the americans, including the son of cabinet secretary ray lahood, are barred from leaving egypt. senior white house correspondent norah o donnell is tracking developments tonight in isshington. norah, good evening. reporter: good evening, jeff. and the obama administration says tonight that they are seply concerned about these eeplrts and urging the egyptian government to change course or risk more than a billion dollars in american aid. as protests in cairo continued for the fourth straight day, an egyptian judge announced his intent to prosecute 43 workers from nongovernmental organizations, including 19 americans. the charges are still unclear, but it s part of a government investigation into international tio-democracy and human-rights groups blaming them for the unrest plaguing egypt nearly a year after president hosni mubarak was ousted. ov