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Marie Harf called on Republicans to speak out against President Trump for the "sexual innuendo" he expressed in a tweet blasting Sen. Kirsten Gillibrand (D-N.Y.)

Trump targeted the junior New York senator Tuesday morning, calling Gillibrand a "lightweight" and claiming she asked him for campaign donations and "would do anything for them."

The broadside came after Gillibrand called on Trump to resign over the numerous and "credible" allegations of sexual misconduct against him. 

Harf said the tweet represents a new low for Trump and called on Republicans to condemn his message. 

"The president of the United States made basically a tweet that has sexual innuendo in it. I think we can all agree there is only one way to read his tweet toward Senator Gillibrand," said Harf, formerly a State Department communications official in the Obama administration.

She called Trump a "jerk" and a bully for the tweet, arguing this type of behavior would not be accepted from a CEO or anyone else. 

"He's the president," she ended.

Gillibrand responded on Twitter and later called it a "sexist smear" that was intended to silence her and other women. 

Watch the full discussion above.

UPDATE, 2:45pm ET: White House Press Secretary Sarah Sanders responded to the critics, saying anyone who thought Trump was making a sexual reference in his tweet has their "mind in the gutter."

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