Is it wise for Trump to call the CIA's intell unbelievable ? (Details )

Trump recently stated that he pretty much didn’t believe the CIA’s claims of Russia hacking or cyber attacking parts of the election process.

The CIA provides intelligence about a wide variety of things. Sometimes the US will act on this intell to use special ops, drones, or open all out war.

If Trump at some point desires to engage another country in war, he will have to explain to the world, and US citizens why. Most presidents source CIA intell as reasons for war.

But Trump has invalidated the CIA before he’s even taken office… Won’t this make it hard for him to defend his position in the future?

How could he be president, and not work with the CIA?