Trump Jr. slams Bannon on Ala. loss: 'keep up the great work'

President TrumpDonald John TrumpHouse Democrat slams Donald Trump Jr. for ‘serious case of amnesia’ after testimony Skier Lindsey Vonn: I don’t want to represent Trump at Olympics Poll: 4 in 10 Republicans think senior Trump advisers had improper dealings with Russia MORE's eldest son on Wednesday slammed former White House chief strategist Stephen Bannon for his work on the  Alabama Senate race, which was won by now-Sen. Doug Jones (D).

Donald Trump Jr.Donald (Don) John TrumpTrump files paperwork to transfer businesses MORE mocked the Breitbart News chief over the defeat of Bannon's chosen candidate, Roy MooreRoy Stewart MooreSeth Meyers mocks Roy Moore riding a horse to vote: ‘Two animals not allowed in the mall’ Colbert on Jones victory: 'It's a Christmas miracle!' Virginia gov on Alabama race: 'America wins. Pedophiles lose!' MORE (R), who had previously defeated an incumbent backed by President Trump, Sen. Luther StrangeLuther Johnson StrangeGOP sen: ‘Just a fact’ Moore will face ethics complaint if elected Trevor Noah: Trump must be ‘morally degenerate’ to back Roy Moore Moore gets boost from Bannon in final days of campaign MORE (R), in the state's primary months before.

"Thanks Steve. Keep up the great work," Trump Jr. tweeted, reacting to Jones's swearing-in ceremony on Wednesday afternoon.

Thanks Steve. Keep up the great work. https://t.co/J9O8CUfJAD

— Donald Trump Jr. (@DonaldJTrumpJr) January 3, 2018

Jones defeated Moore in December after allegations surfaced that Moore decades ago pursued relationships with girls as young as 14. Trump eventually endorsed Moore after the allegations surfaced, citing Jones's liberal record.

Trump Jr.'s attack on his father's former top strategist comes hours after the White House declared war on Bannon over quotes made in a forthcoming book from Michael Wolff detailing the inner workings of the first days of the Trump administration.

Bannon claimed that there is "zero" chance that then-candidate  Trump was not informed about his son's meeting with a Russian lawyer who promised "dirt" on Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonGrassley blasts Democrats over unwillingness to probe Clinton GOP lawmakers cite new allegations of political bias in FBI Top intel Dem: Trump Jr. refused to answer questions about Trump Tower discussions with father MORE.

The meeting between Trump Jr., the president's son-in-law, Jared KushnerJared Corey KushnerKushner: Trump team working on Mideast peace plan unconventional, but ‘perfectly qualified’ US attorney fired by Trump: Mueller team likely looking at everyone Additional Trump transition official identified who knew about Flynn's Russia contact: report MORE, campaign chairman Paul ManafortPaul John ManafortJudge warns Manafort not to discuss case with media Manafort involved in drafting op-ed defending his Ukrainian work: court papers Trump went off on Manafort for suggesting he should not appear on Sunday shows: report MORE and the Russian lawyer, Natalia Veselnitskaya, has become a central focus of special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE's investigation into possible collusion between the Trump campaign and Russia. Trump has previously denied any knowledge of the meeting.

Bannon also refers to Trump Jr.'s conduct as "treasonous," according to excerpts of the book published by The Guardian.

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

Trump himself responded to Bannon's comments in a statement Wednesday, accusing the former chief strategist of losing his mind.

“Steve BannonStephen (Steve) Kevin BannonOwner of Bannon’s DC house requests fence ‘for security reasons’ Bannon: Roy Moore accusers ‘trying to destroy a man’s life’ Billionaire Trump backer cuts ties with Milo Yiannopoulos MORE has nothing to do with me or my presidency,” Trump said. “When he was fired, he not only lost his job, he lost his mind.”