According to a South Korean newspaper, North Korea leader Kim Jong-un took his own toilet to the Singapore summit to protect his poo.
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He was reportedly concerned about "determined sewer divers" having access to his stools.
The leader feared his excretions could reveal his health information if collected and analysed.
The port-a-loo is a regular precaution for the leader - he even takes them around his own country.
Mr Trump and Mr Kim met for the first time in Singapore on Tuesday, and had a 45-minute one-on-one discussion before being joined by aides and advisors.
Human faeces can divulge information about diet, bacteria, and some health issues.
According to Russian newspaper reports discovered in 2016, Stalin regularly had his secret police examine the defecations of other world leaders in a secret lab.