Sen. Ben CardinBenjamin (Ben) Louis CardinSaudi mystery drives wedge between Trump, GOP Overnight Defense: Trump worries Saudi Arabia treated as 'guilty until proven innocent' | McConnell opens door to sanctions | Joint Chiefs chair to meet Saudi counterpart | Mattis says Trump backs him '100 percent' Turkish police have 'certain evidence' missing Saudi journalist was killed: report MORE (D-Md.) is calling on President TrumpDonald John TrumpFive takeaways from Cruz, O'Rourke's debate showdown Arpaio files libel suit against New York Times IMF's Christine Lagarde delays trip to Middle East MORE to apologize for comments made by White House aide Kelly Sadler, who mocked Sen. John McCainJohn Sidney McCainComey donates maximum amount to Democratic challenger in Virginia House race Live coverage: McSally clashes with Sinema in Arizona Senate debate Is there difference between good and bad online election targeting? MORE’s (R-Ariz.) brain cancer diagnosis.

"I would like to hear something from the president of the United States," Cardin told CNN on Friday. "The president should be saying that 'this was unacceptable under my watch, I will not tolerate such comments.' But we haven't heard a word from the president."

Sadler responded to the Arizona senator’s opposition to Gina Haspel’s nomination for CIA director by joking Thursday morning that it doesn't matter because “he’s dying anyway,” The Hill first reported.

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Cardin tweeted Thursday that he wanted to wake up to a “slew” of apologies to McCain on Friday morning. Though Sadler apologized to McCain’s daughter, Meghan McCain, Trump has not commented publicly about the incident. 

Asked by CNN if Republicans should speak out against Sadler’s comments, Cardin said all leaders should.

"Leaders have a responsibility to speak out when things are done that are against the traditions and values of this country. And that statement went beyond what is acceptable," Cardin said. 

Though Cardin wouldn't say the Trump aide should lose her position, he added he thought the situation was "something that needs to have some disciplinary results."

"To make that type of comment, there's no place for that anywhere in our society, let alone the White House,” Cardin said.