Vice President Harris said she's ready to step in as president amid growing concerns over President Biden’s age and mental acuity, prompting scorn from Republican lawmakers and support from her fellow Democrats.

"She's vice president of the United States," Rep. Alexandria Ocasio-Cortez, D-N.Y., said when asked if Harris was ready to serve as president. "She better be."

Rep. Alexandria Ocasio-Cortez

Vice President Harris "better be" ready to serve as president if called upon, Rep. Alexandria Ocasio-Cortez, D-N.Y., told Fox News on Wednesday. (Megan Myers/Fox News Digital)

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The New York Democrat added that Harris has been "doing a solid job as vice president" and a major part of her constitutional responsibility is "to stand at the ready."

Special Counsel Robert Hur, appointed by Attorney General Merrick Garland, released an investigative report last week recommending no charges against Biden for his actions related to mishandling classified documents, partly due to the president's potential defense at trial as a "sympathetic, well-meaning, elderly man with a poor memory."

The assertion led to increased scrutiny over President Biden's age and mental abilities, particularly among Republicans, but Harris said she was "ready to serve" during an interview ahead of the report's release.

"I am ready to serve. There’s no question about that," Harris told The Wall Street Journal, adding that everyone who observes her work "walks away fully aware of my capacity to lead."

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Rep. Monica De La Cruz, R-Texas, said the vice president's comments exacerbated concerns about the current commander in chief.

"What's scary is that she is basically admitting that he is not able to serve," the Texas Republican told Fox News on Wednesday. "Look, we don't need four more years of Biden, and we certainly don't need one day of President Harris."

Rep. Gary Palmer, R-Ala., said a Harris administration "would be an unmitigated disaster."

"It's two of the most clueless people that have ever been in the executive office," Palmer told Fox News.

Kamala Harris

Vice President Harris said in an interview last week that she's "ready to serve" as commander-in-chief if called upon. (Brandon Bell/Getty Images)

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Rep. Juan Ciscomani, R-Ariz., said America has already "seen the results of the vice president's version of serving."

"As the border czar, she's done a terrible job and I have no confidence that she will do any better doing anything else," the Arizona Republican said.

Rep. Austin Scott, a Republican from Georgia, said he doesn't "know what she's ready for."

"She doesn't seem to even make a coherent statement," Scott said.

Rep. Juan Ciscomani

Rep. Juan Ciscomani, R-Ariz., said the results of Harris' leadership are already clear at the southern border. "She's done a terrible job" as border czar, he told Fox News on Tuesday. (Megan Myers/Fox News Digital)

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But Rep. Madeleine Dean, a Democrat from Pennsylvania, bristled at the question of Harris' readiness.

"Of course she's ready to serve. What an absurd question," Dean said.

To hear more from lawmakers about a potential Harris presidency, click here.

Ramiro Vargas contributed to the accompanying video.