Sen. Ben CardinBenjamin (Ben) Louis CardinDems ask Mnuchin to probe Russian investment in state election tech Hillicon Valley: Trump officials deliver show of force on election security | Apple hits trillion | How fake Facebook groups manipulated real activists | Senate group seeks new Russia sanctions Senators introduce bill to slap 'crushing' new sanctions on Russia MORE (D-Md.) is calling on President TrumpDonald John TrumpDems make history, and other takeaways from Tuesday's primaries Pawlenty loses comeback bid in Minnesota Establishment-backed Vukmir wins Wisconsin GOP Senate primary MORE to apologize for comments made by White House aide Kelly Sadler, who mocked Sen. John McCainJohn Sidney McCainDem strategist: Trump thinks of McCain as 'he who should not be named' Omarosa book: Trump called Montenegro prime minister a ‘whiny punk b----’ The Hill's Morning Report — Trump’s GOP feuds dominate ahead of midterms 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.