Rep. Jackie Speier Karen (Jackie) Lorraine Jacqueline SpeierOvernight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies House to vote on 'I Am Vanessa Guillén' bill Overnight Defense: Trump's battle with Pentagon poses risks in November | Lawmakers launch Fort Hood probe | Military members can't opt out of tax deferral MORE (D-Calif.) says that President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE's "abusive" comments on the violence in Charlottesville, Va., suggests that he may be unstable and incapable of discharging his duties as president.

In an interview with CNN's Jim Sciutto on Tuesday, Speier called Trump's behavior "erratic" and suggested that it may be time for Vice President Pence and the Cabinet to determine whether to invoke the 25th Amendment.

"There is a growing mountain of evidence that the president has been very erratic," she said. "Has shown mental instability. It was crystallized last week with the combination of his comments about 'fire and fury' that he offered up against Kim Jong Un in North Korea and how we would 'take him out.' "

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"Followed by his back-and-forth on Charlottesville, and how he really became almost abusive, in calling people out, when he was telling from his soul what he thought about the Charlottesville incident."

The 25th Amendment of the Constitution allows the vice president and a majority of Cabinet leaders to determine whether the president is unable to discharge his duties.

Trump came under fire last week for his remarks in the wake of violent demonstrations in Charlottesville, where white nationalist and neo-Nazi groups held a "Unite the Right" rally to protest the removal of a Confederate statue.

In comments immediately after the mayhem, Trump blamed "many sides" for the violence — an assertion he doubled down on three days later, when he appeared to equate hate groups with the counterprotesters who opposed them.

Speier's remarks on Tuesday weren't her first in favor of invoking the 25th Amendment on Trump. Just last week, she said via Twitter that the president was "unhinged" and that it was time to invoke the rule.