Does he have any law enforcement or legal expertise? From what I've read, the FBI were close to rebelling over Comey's handling of the E-mail situation. Perhaps Comey's replacement will have to come from within FBI?
Comey needed to go. He was a complete clown. His comportment reminded me of the kind of lazy kid at school with a slight smug expression etched on his face and was barely bothered to do a tap but mouth cheap platitudes.
But I think the abrupt, impersonal fashion in the way Trump sacked him will stoke a bigger backlash than needed to be the case. But maybe that's what he wants -- an unambiguous declaration of war on his enemies.