"Your Dad is a 5th degree black belt when it comes to sexual impropriety allegations", Baldwin wrote.
Baldwin responded with the quip about the president's "black belt" status, adding that Trump once "crashed" a Baldwin party at the Plaza Hotel and "hit on my wife" until she "showed his fat ass the door".
Trump bought the Plaza Hotel in NY in 1988.
Actor Billy Baldwin Accuses Donald Trump Of Hitting On His Wife
Baldwin has been married to Chynna Phillips, a singer with the band Wilson Phillips, since 1995 and the two have three children.
But Trump has publicly discussed hitting on married women.
"She showed his fat ass the door", he added.
Baldwin's older brother, Alec, won an Emmy Award for his biting portrayal of Trump on "Saturday Night Live", while younger brother Stephen endorsed Trump's run for president.
Les particules fine, néfastes pour le sperme
L'Organisation mondiale de la santé préconise de limiter l'exposition aux PM 2,5 à 10 µg/m3 en moyenne annuelle. A l'heure actuelle, près de 50 millions de couples souffriraient d'infertilité dans le monde.
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