U.S. Rep.-Elect Alexandria Ocasio-Cortez responded to comments made by outgoing Sen. Claire McCaskill earlier this week in which she called the New York Democrat a “bright shiny new object.”

“Not sure why former Sen. McCaskill keeps going on TV to call me a ‘thing’ and ‘shiny object,’ but it’s pretty disappointing,” Ocasio-Cortez tweeted Saturday.

“McCaskill promised she’d ‘100 percent back Trump up’ on his anti-immigrant rhetoric and lost. In [Missouri], almost all progressive ballot issues won,” her tweet continued.

Related: McCaskill of Missouri Complains About Media Obsession with the Young New York Democrat

During an interview with CNN, McCaskill, a Missouri Democrat, said of Ocasio-Cortez that she was “confused why she’s the thing.”

McCaskill was referring to the attention Ocasio-Cortez has received from both major parties and the news media since defeating Democratic incumbent Rep. Joe Crowley in a June primary race, then beating Republican Anthony Pappas in November.

“But it’s a good example of what I’m talking about — a bright shiny new object, came out of nowhere and surprised people when she beat a very experienced congressman,” McCaskill said.

Related: Ocasio-Cortez Just Realized How Expensive It Is to Live in Washington, D.C.

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McCaskill also cautioned Democrats to be wary of cheap rhetoric from rising Democratic stars like Ocasio-Cortez and said Republican senators privately think President Donald Trump is “nuts.”

Ocasio-Cortez, a self-described Democratic socialist, has made climate change, income inequality and ending the “school-to-prison pipeline” her top priorities.

In a follow-up tweet, Ocasio-Cortez mentioned McCaskill again.

“I’m also not sure why McCaskill is covering for the GOP by saying they ‘secretly think Trump is nuts.'”

“Nobody cares,” Ocasio-Cortez also wrote.

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“Trump is melting down our institutions and inciting division between people.”

“At any time GOP could have checked him and choose not to. They’re accomplices,” she added.

And check out this video:

This Fox News piece is used by permission.

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