Exclusive: Ex-Trump aide Stephanie Grisham says 'I am terrified' of Trump running in 2024

In an exclusive interview with ABC News' Juju Chang, former Trump aide Stephanie Grisham says she is "terrified" that her former boss may run for office again.

Stephanie Grisham, one of former President Donald Trump's most senior and longest-serving advisers, says she is "terrified" that her former boss may run for office again.

"I am terrified of him running in 2024," Grisham, who served as both Trump's press secretary and first lady Melania Trump's chief of staff, told "Nightline" co-anchor Juju Chang in a wide-ranging exclusive interview on the eve of the publication of Grisham's new book.

"I don't think he is fit for the job," Grisham said. "I think that he is erratic. I think that he can be delusional. I think that he is a narcissist and cares about himself first and foremost. And I do not want him to be our president again."

Asked by Chang what scares her the most, Grisham painted a grim picture of what could happen if Trump ends up running again in 2024.