(NewsNation) — A former director of the Centers for Disease Control and Prevention says the autism rate in the world has increased significantly.

"I think it suggests that there's actually environmental factors," Dr. Robert Redfield told "Elizabeth Vargas Reports" on Monday following President Trump's announcement on Tylenol guidance for pregnant women.

"Clearly, the previous approach that thought maybe this was genetic really didn't seem rational when you saw the increase of cases, one from 1 to a thousand, 1 to 5, 1 to a 100, 1 to 30, that is probably not genetic," added Redfield.

Trump discourages Tylenol for pregnant women due to potential link to autism

During a news conference Monday, Trump discouraged pregnant women from taking Tylenol, saying research needs to be done to see if

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