The social networking platform exempts politicians from third party fact checking standards, and an open letter sent to company executives - back by more than 250 people - has slated the policy.
According to the New York Times newspaper, the letter says: "Misinformation affects us all. Our current policies on fact checking people in political office, or those running for office, are a threat to what FB stands for.
"We strongly object to this policy as it stands.
"It doesn't protect voices, but instead allows politicians to weaponise our platform by targeting people who believe that content posted by political figures is trustworthy."
The employees have also urged bosses to restrict politician's capacity to target potential voters.
They continued: "These ads are often so micro-targeted that the conversations on our platforms are much more siloed than on other platforms."
Facebook has already applied similar restrictions to ads for housing, education or credit to prevent potential discrimination.
Facebook CEO and co-founder Zuckberg recently defended the company's stance on fact checking politicians.
He said: "I don't think most people want to live in a world where you can only post things that tech companies judge to be 100% true."