“I could be Oprah Winfrewes in 10 years, or I could be a comedian, or an actor,” the author said in an interview with a local news station in Japan.
“I’m very open about it, I’m not shy about sharing that information.”
The author, who has written for publications including The Guardian and The Washington Post, said he is currently working on a book about his experiences, which is expected to be released in the coming months.
The comments came after the publication of an article by The Washington Times on Monday, which detailed how Mr Trump has attempted to silence his critics and critics of his administration.
The newspaper said Mr Trump “is determined to silence critics of the president and to silence anyone who challenges him”.
Mr Trump, the newspaper said, had been “using a variety of tactics, from direct threats, to using social media, to threatening people with lawsuits and even threats of murder”.
“His team has worked hard to silence any and all critics of Trump, whether they are Democrats or Republicans, liberals or conservatives, and now, he’s attempting to silence me.”
Mr Trump and Mr Bannon have been friends for decades, but have clashed repeatedly on Twitter.
Mr Trump said during a meeting with Chinese President Xi Jinping on Tuesday that the US would not be bound by the Paris climate agreement, which he said had “done a disservice” to the United States.
Mr Bannon told the Associated Press on Tuesday, however, that the “bitter pill” of climate change is “going to come down on Trump”.
“There’s going to be a bitter pill on his desk that’s going be picked up by the press, and then we’ll all have to live with it, and we’ll have to learn how to deal with it,” Mr Bannon said.
The White House has defended Mr Trump’s tactics, saying he was merely voicing his opinion on Twitter, which was also where he had access to classified information.
Mr Mattis told CNN on Wednesday that “the president does not need the permission of Congress to fire people”.
“I don’t think the president is going to tell the Congress to go in and remove someone,” he said.
“He’s going in and he’s going after them.
I think he’s very clear on that.”