Comey details why Trump's lie about staying over night in Moscow is 'significant'

In a CNN town hall with Anderson Cooper, former FBI director James Comey answered questions from students and faculty at William & Mary law school on Wednesday.

He talked about his lasted book, "A Higher Loyalty" that details his experiences working with Donald Trump.

Cooper asked Comey if it was significant that Trump lied about not spending the night in Russia.

Comey revealed to the audience how to easily spot a lie.

"It’s always significant when someone lies, especially about something you didn’t ask about,” Comey said.

Watch the full clip below!