. . Announcer from nbc news World Headquarters in new york, this is nbc nightly news with lester holt. Good evening, the Clinton Campaign is vowing to release more information about her health as they face questions of whether they were trying to keep her diagnosis with a case of pneumonia a secret. The revelation came hours after clinton appeared unsteady on her feet after she was being escorted from yesterdays 9 11 memorial here in new york. The campaign, which first attributed her illness to the heat, is now admitting they were slow to publicly disclose her condition. Tonight shes off the campaign trail resting at home and our Andrea Mitchell has the latest. Reporter tonight, Hillary Clinton out of sight, recovering from pneumonia. Cancelling a california trip. After that video showing her nearly collapsing, leaning on secret Service Agents after abruptly leaving the 9 11 memorial service. Aides now admitting condition and will disclose more. We could have gotten more information ou