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President Trump's eldest son responded to accusations of "treasonous" behavior by Breitbart News executive Steve Bannon, a former White House adviser.

In excerpts from an upcoming book by Michael Wolff, Bannon criticized a meeting Donald Trump Jr. had with Russian nationals at Trump Tower in Manhattan, N.Y.

NEW! @realDonaldTrump issues statement hitting Bannon: “ When he was fired, he not only lost his job, he lost his mind. pic.twitter.com/rtd74NzzHc — Fin Gomez (@finnygo) January 3, 2018

"Even if you thought that this was not treasonous, or unpatriotic, or bad s**t, and I happen to think it’s all of that, you should have called the FBI immediately," Bannon said.

Bannon also said the 40-year-old executive vice president of the Trump Organization will "crack like an egg" in any possible public testimony about the situation.

Trump Jr. fired back on Twitter late Wednesday, calling Bannon "an opportunist" who brought "a nightmare of backstabbing, harassing, leaking [and] lying" to the White House.

Steve had the honor of working in the White House & serving the country. Unfortunately, he squandered that privilege & turned that opportunity into a nightmare of backstabbing, harassing, leaking, lying & undermining the President. Steve is not a strategist, he is an opportunist — Donald Trump Jr. (@DonaldJTrumpJr) January 3, 2018

"Steve had the honor of working in the White House and serving the country. Unfortunately, he squandered that privilege," Trump Jr. said.

Wow, Just looked at the comments section on Breitbart. Wow. When Bannon has lost Breitbart, he’s left with . . . umm, nothing. — Donald Trump Jr. (@DonaldJTrumpJr) January 3, 2018

Trump Jr. also criticized Wolff's book, discrediting another excerpt that claimed he said his father "looked like a ghost" and his step-mother Melania was "crying" tears "not of joy" on election night.

Another good one. Anyone who knows me or follows me knows that's about as far from something I would say or how I speak as possible... What a joke. https://t.co/4L9rYK8W56 — Donald Trump Jr. (@DonaldJTrumpJr) January 3, 2018

"Anyone who knows me... knows that's about as far from something I would say... what a joke," Trump Jr. tweeted.

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