reported mueller's investigators have been tracking down partners particularly interested in interactions with michael koby. trump had a warning for mueller, stay away from family and business. >> mueller was looking at your finances, your family's finances unrelated to russia. that a red line? >> wouldn't that be a breach of what his actual charge is? >> i would say yes. >> earlier this evening, president trump was asked again if he would fire mueller. let's watch. >> why don't i just fire mueller? well, i think it's a disgrace what's going on. we'll see what happens. but i think it's really a sad situation when you look at what happened. and many people have said you should fire him. again, they found nothing. and in finding nothing, that's a big statement. if you know the person whose in charge of the investigation, you know all about that deputy