US President Donald Trump lashed out at Senator Kirsten Gillibrand after she called for his resignation over the numerous sexual misconduct allegations levied against him and Twitter is ruthlessly slamming him over his "extremely sexist" and suggestive remarks. In a tweet posted early Tuesday (12 December), Trump called the Democratic senator a "lightweight" who would "do anything" for campaign contributions.

"Lightweight Senator Kirsten Gillibrand, a total flunky for Chuck Schumer 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. Very disloyal to Bill & Crooked-USED!" Trump tweeted.

The tweet quickly triggered fierce backlash with many blasting the president over his sexist remarks.

Gillibrand, who is seen as a potential 2020 presidential candidate, fired back at Trump over the attack saying: "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."

While many jumped to Gillibrand's defence and condemned Trump over his "sexist smear", the White House defended the president saying "only if your mind is in the gutter would you have read" the post as sexual innuendo.

"There's no way that this is sexist at all," White House press secretary Sarah Huckabee Sanders said. "This is simply talking about a system that we have that is broken in which special interests control our government. And I don't think that there's probably many people that are more controlled by political contributions than the senator that the president referenced."

She added that Trump's latest comments merely reflected his stance on a corrupt political culture and campaign pledge to "drain the swamp."

"This is the same sentiment that the president has expressed many times before when he has exposed the corruption of the entire political system. In fact, he's used similar terminology many times when talking about politicians of both parties, both men and women," she said. "The system is clearly broken. It's clearly rigged for special interests. And this president is someone that can't be bought and one of the reasons that he's president today."

Meanwhile, Twitter viciously slammed the president over his "outlandish" statement as well as the White House for defending him and his behaviour.

"After writing this, do you still want us to believe that wasn't you in the Access Hollywood video?" Walter Shaub, former director of the United States Office of Government Ethics, tweeted.

"Why don't you learn to be an adult?" one Twitter user wrote.

Democratic Representative Jackie Speier tweeted: "@SenGillibrand is a fierce advocate for women who deserve the utmost respect. The President hasn't seen the full wrath of America's women yet, but he's about to. #25ththe45th #25thAmendment"

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Trump slammed Democratic Senator Gillibrand with a "sexist smear" and Twitter immediately lambasted him for it. Isaac Brekken/Getty Images