They never give a reason past corrupt Joe Biden is running for President for it being unethical. So they're establishing that running for President makes him immune to being investigated for committing crimes. Then if he wasn't running, Biden is fair game.

There are some that say a US President should not be asking about investigating a US citizen if they committed crimes that involves a foreign country. If the person at the top of Executive Branch can't ask about that then all forms of enforcement cooperation with other countries should be axed on all levels.

Does a big book of President phone call ethics exist? If so, they should bring it out and cite where it says this unethical nonsense comes from.