First two that come to mind are these two, but I am guessing there are hundreds!

Call him a Buffoon! a Spoiled Little Child a privileged little prick!

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The thing about most kids is that they are trying to figure out what they think of the world and usually don't care too much what their parents think. So for the most part they are a clean slate politically and for 8 years they saw Obama who was eloquent, brilliant, even tempered, compassionate, likable, fun and well prepared for the job of being president. To these young folks Obama = Democrat. Now they see Trump and he is a fucking walking disaster on every level! Racist, mean spirited, egocentric, shallow, dumb, incompetent, out of control, sexist and a fucking crook! After 8 years of Obama they are seeing this shit show and they are thinking Trump = Republicans especially since the GOP is in a big bind having to back him up in fear of losing their base. So these two mean have shaped their impression of both parties. There could not be a bigger contrast to someone who isn't already prejudiced in their thinking of the world. Trump is causing lasting damage to the GOP, no doubt about it and Obama was a great role model / ambassador for the Democratic Party for this generation. A generations views of the world has taken shape and this can only mean great things for the US for quite some time.

Can Trump put in a temporary replacement without them getting confirmed? If not then I don't see how it would impact the investigation that much. Trump needs some scoundrel in there to gum things up but that person needs to get confirmed first.