A former aide to Hillary ClintonHillary Diane Rodham ClintonLate night hosts targeted Trump over Biden 97 percent of the time in September: study 10 steps toward better presidential debating Continuity is (mostly) on the menu for government contracting in the next administration MORE criticized Sen. Kirsten GillibrandKirsten GillibrandHillicon Valley: Facebook, Twitter's handling of New York Post article raises election night concerns | FCC to move forward with considering order targeting tech's liability shield | YouTube expands polices to tackle QAnon Democrats question Amazon over reported interference of workers' rights to organize Dueling town halls represent high stakes for Trump MORE on Thursday after the New York Democrat became the first of many senators to join a successful push to force the resignation of Sen. Al FrankenAlan (Al) Stuart FrankenTed Cruz mocks Al Franken over 'I Hate Ted Cruz Pint Glass' GOP Senate candidate says Trump, Republicans will surprise in Minnesota Peterson faces fight of his career in deep-red Minnesota district MORE (D-Minn.).

Philippe Reines argued during an appearance on Fox News's "Tucker Carlson Tonight" that Gillibrand isn't sufficiently explaining why she called for the resignation of Franken this week and former President Clinton previously.

"She's not putting in context her rationale for who she calls for resignation and when," Reines said Thursday. "She two weeks ago called for Bill ClintonWilliam (Bill) Jefferson ClintonLate night hosts targeted Trump over Biden 97 percent of the time in September: study A closing argument: Why voters cannot trust Trump on healthcare On India, the US must think bigger MORE's resignation, or saying Bill Clinton should have resigned two decades ago."

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"[She] didn't really say why, she never said say she regretted not speaking earlier, or taking the Clintons' support or money," Reines continued. "And then goes a few weeks without saying anything on Sen. Franken until yesterday."

Reines reiterated that he thought Gillibrand, a possible 2020 Democratic presidential contender, had not explained her "rationale" for demanding these figures' resignations.

"That's not to say her decision was wrong. She was joined by 29 other senators," he added. "But most people have been discussing this in a framework of, 'If someone does this, it's unacceptable and they should resign.' It's unclear in the way she's been, in describing her actions, what that rationale is."

Reines, who served under Hillary Clinton at the State Department, has repeatedly attacked Gillibrand in recent weeks, labeling her a "hypocrite" last month after she argued that Bill Clinton should have resigned for his sexual misconduct in the White House.

"Her point was strange to me because she probably didn't come to this feeling and thought and position yesterday," Reines said on Fox News in November.

"Why she wouldn't have in the last 20 years vocalized it is strange to me. Nothing was stopping her."

Gillibrand responded to Reines on MSNBC, calling the former adviser "ridiculous" and "wrong."

"Ridiculous, and he's wrong," Gillibrand said at the time. "Bill Clinton did very important things for this country. But my point is about this conversation we are having today, and that we need to have the highest standards for elected leaders, and we have to change what's happening throughout society, and we have to allow people to tell their stories."