He also deemed the recent revival of sexual misconduct allegations against his father the "distraction of the week", adding that the accusations are "totally unfounded" and "baseless". Mazie Hirono, the Democrat senator from Hawaii, called Mr Trump a "misogynist".
Gillibrand and a chorus of Democrats declared Trump's tweet to be sexually suggestive, an assertion the White House flatly rejected. The interesting reason is that current fashions in Democratic orthodoxy open up new possibilities in passive-aggressive slander for left-leaning cynics.
The New York lawmaker is the only senator Trump chose to assault Twitter.
Senator Corey Booker was among the men who had joined Gillibrand in calling for Trump to resign over the sexual misconduct allegations.
Gillibrand appeared to cast a chill on her relationship with the Clintons when she said last month that Bill Clinton should have resigned the presidency in light of his affair with intern Monica Lewinsky.
In September 2016, the editorial board broke with its long-standing tradition of not endorsing a candidate in presidential elections by penning an editorial entitled "Trump is 'unfit for the presidency".
And branded then-primary rival Carly Fiorina less-than-presidential material by saying, "Look at that face!"
"Jill Harth described how the president attempted to get up her dress". She called the Democrats' response to Trump's Gillibrand tweet "laughable".
That prompted Trump's controversial tweet on Tuesday. "I think we've gotten pretty good at tuning out distractions".
Warren's unusual choice of language in defending her colleague raised many eyebrows.
"President Trump should resign", Gillibrand tweeted Monday. Of course, they now constitute Trump's base. Trump likely hopes Alabama voters will see his tweets and the hysteria surrounding them as much ado about nothing, and wonder if the accusations against Moore are much of the same.
Kirsten Gillibrand hit back against President Trump on Wednesday, after he called her a "total flunky" on Twitter and accused her of "begging" him for campaign donations. He also said Gillibrand had begged and "would do anything for" campaign contributions.
Senator Kirsten Gillibrand became the latest woman to be subjected to President Trump's sexual misconduct.
"Do you know who you're picking a fight with?" she added.
"[Trump] should have apologized for being a sexist pig", Brzezinski said. "There's no way that this is sexist at all". "I implored her to cease her hectoring". It's like a magnet. The slut is Trump.