It's possible President Donald Trump's "Pocahontas" comment could contribute to his impeachment.
That's what American University political historian Allan Lichtman told Newsweek on Nov. 28.
The day before, Trump sparked outrage when he mocked Democratic Sen. Elizabeth Warren of Massachusetts, calling her "Pocahontas" during an event honoring Native Americans.
According to Lichtman, such a comment is an "Abuse of Congress" -- an allegation that can impeach a president, and in fact already has.
In his articles of impeachment, President Andrew Johnson was accused of "intemperate, inflammatory and scandalous harangues ... and loud threats and bitter menaces ... against Congress."
"Certainly it shows, at least at one time, the House of Representatives considered this kind of attack on an important societal institution worthy of impeachment," Lichtman said.
By itself, Lichtman concedes the Pocahontas comment is not enough to impeach Trump. Still, it could help strengthen the case against the president.
"That could be a part of an article of impeachment," Lichtman said. "After all, you could couple that with his very intemperate attacks on the judiciary. Combine that with his attacks on the free press. You could couple all of that together and create a fairly powerful article of impeachment."
Lichtman notes it's not just Warren who Trump has gone after. Trump has also put down other members of Congress: Republican Sens. Bob Corker of Tennessee, Jeff Flake and John McCain of Arizona, as well as Democratic leaders Sen. Chuck Schumer of New York and Rep. Nancy Pelosi of California.
"I think it’s very dangerous, coupled with all his other attacks," Lichtman explained. "It’s all of a piece. Maybe no one act is outrageous enough to justify impeachment, but when you put it all together I think it does constitute a clear abuse of presidential power."
Lichtman, who predicted Trump would win the presidency when everybody else doubted it, previously warned of an impending impeachment.
Before the Pocahontas comment, Lichtman predicted Trump will be impeached by spring 2018.
"It would likely come by the spring of 2018, or whenever Republicans come to believe that Trump is jeopardizing their re-elections in 2018," writes Lichtman in an article for Time magazine.
But back then, Lichtman argued the impeachment would come as a result of special counsel Robert Mueller’s Russia investigation.
"We have so far seen only the tip of Mueller’s iceberg," writes Lichtman. "New indictments and perhaps other flipped witness are certain to follow in Mueller’s relentless investigation of the the Trump-Russia connection and also allegations that the president obstructed justice."
"A Russian sword of Damocles is hanging over this American president by the slenderest of threads," he adds. "When this sword falls even Republicans, as in the Nixon case, will likely be compelled to begin impeachment proceedings."