Clinton protocol. This has been their methods for years many years. When/if cornered, it's "deny, deny, deny" and blame their opponent(s).
Like Dinesh Desouza learned when he was sent to prison by Obama for campaign violations, every prisoner told him the key to being a professional criminal, "Never give up the con, ever." Corrupt bureaucrats, politicians and criminals know this. They will never admit they spied on Trump, ever.