From pneumonia. Rick leventhal has more on clintons stumbling into her van. Reporter this video Shows Hillary clinton standing on a sidewalk outside the World Trade Center site. She appears unsteady stepping off the curb with aides in her protective detail holding her by the arms. She simples as she gets close to the van with one of her shoes falling off before shes helped inside. A Law Enforcement source who was 15 feet away said they were caught off guard by her premature departure which is why mrs. Clinton had to wait for her motorcade pull up. He said he saw her knees buckle and watched as someone picked up her shoe and gave it to one of the agents in the two vehicles that followed the former first lady to her daughters apartment nearly 3 miles away. Mrs. Clinton left because she felt overheated and was feeling much better her statement said and just before noon she emerged from her daughters building smiling and making remarks. I feel great. Its a Beautiful Day in new york. Report