WASHINGTON (AP) – Donald Trump is doubling down on his attacks on a former Miss Universe.

Trump unleashed a series of tweets early Friday saying that rival Hillary Clinton had shown bad judgment in using Alicia Machado “as a paragon of virtue.”

He offered no proof that Clinton had a role in Machado’s citizenship. The “sex tape” reference was apparently about risque footage circulating online of Machado from when she appeared on a Spanish reality show.

At Monday’s debate, Clinton cited Trump’s past references to Machado as “Miss Piggy” and “Miss Housekeeping” as examples of Trump’s disrespectful comments about women.