Oh, you know, nothing big... Just Rudy Giuliani talking about semen on a dress.https://t.co/NRGYsB6DtH — Parker Molloy (@ParkerMolloy) October 10, 2016

"There was semen on her dress," Giuliani, the former New York mayor, told Matthews in the 'spin room' after the debate Sunday night.

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"Ok," Matthews replied, with an uncomfortable expression.

"Which proves he lied to America," Giuliani added.

By referring to Clinton's affair with White House intern Monica Lewinsky — and the infamous stained blue dress — Giuliani was running off of a line of attack run by the Republican presidential nominee and his allies throughout the day.