said that he directed the EPA to investigate low-flow fixtures because people needed to flush toilets 10 to 15 times?

They take a shower and water comes dripping out, just dripping out very quietly dripping out. People are flushing toilets 10 times, 15 times, as opposed to once. They end up using more water. So, EPA is looking at that very strongly, at my suggestion.

Reuters – Trump takes aim at trickle-down toilets, faucets
Business Insider – Trump says the EPA is looking ‘very strongly’ at ‘sinks and showers and other elements of bathrooms’ because people are flushing their toilets 10 to 15 times
The Washington Post – Trump Orders Toilet Rule Review Over Low-Flow Flushing