For more on the situation in tonga, we're joined by dr. frances wolyvoly, nutrition specialist for unicef, and joins us live from fiji. good to have you with us, doctor. >> you're welcome. nice to be with you, as well. >> there is a multinational effort under way right now, there's aid coming from new zealand, australia, other countries set to send more aid in the coming days. what's most critically needed right now? >> from what we have gathered, the assessment data, the main concerns that remains is access to safe and clean drinking water. it's also food security and the effects of the ash c...