(CNN) A former Pentagon and CIA spokesman on Wednesday slammed Donald Trump for giving credit to WikiLeaks Founder Julian Assange and warned that America will be less safe when the President-elect takes office later this month.

"Let's stare this reality square in the face: PEOTUS is pro-Putin and believes Julian Assange over the @CIA. On Jan. 20 we will be less safe," tweeted George Little, who served under former President George W. Bush and President Barack Obama.

Let's stare this reality square in the face: PEOTUS is pro-Putin and believes Julian Assange over the @CIA. On Jan. 20 we will be less safe. https://t.co/3qhDLjuGMk — George Little (@georgelittledc) January 4, 2017

Trump has repeatedly questioned and dismissed the intelligence community's conclusion that the Russian government was behind election-related hacking.

Despite not trusting their findings, the intelligence community is the main body Trump will rely on for security advice as head of state.

Trump also tweeted intelligence officials postponed an "'intelligence' briefing on so-called 'Russian hacking'" that they were set to deliver to him this week because they might need more time "to build a case." He called the move "very strange."

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