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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.

"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 and serving the country. Unfortunately, he squandered that privilege," Trump Jr. said.

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.

"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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