Timothy Naftali, a presidential historian for the network, said the president-elect should not try to cast doubt on the nation's top spy agencies.
'It's a bad idea': CNN commentator says Trump should stop questioning US intelligence agencies
Donald Trump's tweets questioning the US intelligence community's handling of the Russian cyberattack investigation prompted a warning from a CNN commentator on Tuesday night.
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"It's a bad idea," Naftali said, "the intelligence community has information about him that I'm sure he would like not to be released."
Naftali stopped short of implying there's a big secret about the incoming president, but said "it doesn't make sense for Trump to be making adversaries in the intelligence community ... a community that serves presidents regardless of party."
He suggested Trump should "stay silent" about the Russian hacking investigation.
Trump tweeted earlier on Tuesday night: "The 'Intelligence' briefing on so-called 'Russian hacking' was delayed until Friday, perhaps more time needed to build a case. Very strange!"