The scope of Mueller's mission needs to be confined to the Russian hoax. Trump isn't on trial for every business deal he ever made. Leftists want to prosecute him nonstop. They have nothing positive for America so destroying their enemy is a must.
There is no evidence that Mueller is looking at every business dealing Trump has done. He is looking at Trump's Russian business dealings. That is well within the scope of his investigation. Ken Starr prosecuted several criminal cases that were not part of the original scope of his investigation. Do you disagree with that investigation?