MSNBC's Mika Brzezinski on Tuesday said President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE in a tweet suggested that Sen. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.) would "have sex with him" to get campaign contributions.

Brzezinski called it "reprehensible" that Trump would say something so "derogatory and disgusting" about a woman. She tore into Trump, saying he treats women like "punching bags."

"Let's just say it," she said on MSNBC's "Morning Joe."

"He's suggesting that Kirsten Gillibrand would have sex with him in order to get campaign contributions. The president actually tweeted that this morning."

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Her comments came after President Trump tweeted Tuesday morning that Gillibrand would "do anything" for campaign contributions.

"Lightweight Senator Kirsten Gillibrand, a total flunky for Chuck Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE and someone who would come to my office 'begging' for campaign contributions not so long ago (and would do anything for them), is now in the ring fighting against Trump," he tweeted.

"Very disloyal to Bill & Crooked-USED!"

Gillibrand on Tuesday responded to the tweet, saying Trump could not silence her.

"You cannot silence me or the millions of women who have gotten off the sidelines to speak out about the unfitness and shame you have brought to the Oval Office," she tweeted.

The exchange came a day after Gillibrand said Trump should resign from office because of the accusations of sexual misconduct numerous women have made against him.

Gillibrand in November joined Rep. Jackie Speier Karen (Jackie) Lorraine Jacqueline SpeierOvernight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies House to vote on 'I Am Vanessa Guillén' bill Overnight Defense: Trump's battle with Pentagon poses risks in November | Lawmakers launch Fort Hood probe | Military members can't opt out of tax deferral MORE (D-Calif.) to introduce The Member and Employee Training and Oversight On Congress Act (ME TOO Congress) Act, which would require sexual harassment awareness training and reform the process available for staffers to file complaints.