What he is trying to hide is that the bases that would have restocked the Lincoln were destroyed in the immediate aftermath of Trump's initial bombing of Iran, and Hegseth didn't want to tell him. So he kept it a secret from the president, and everyone else, and thought that would be the end of it.
Like all stupid MAGAs, Hegseth didn't consider the next steps, so he never thought about what would happen when a city on water didn't get any logistical support at all, until it became such an enormous scandal that it could not be contained any longer.