At the heart of the matter is the issue of cybersecurity, with intelligence officials saying that hackers directed by Russia engaged in covert activities intended to interfere with the U.S. election.
Trump and his transition team have disputed these conclusions, claiming that they are politically motivated.
The statement and the tweet were the latest salvos in a battle that has been waged in the press since late last week.
The acrimonious relationship between Trump and the intelligence agencies spilled out into the public over the weekend with the two sides engaging in a war of words that has played out in the pages and programs of national media outlets.
Over the weekend, Trump confirmed earlier press reports that he had been skipping regular intelligence briefings, which have been a fixture in the presidential schedules for decades.
“You know, I'm, like, a smart person. I don't have to be told the same thing in the same words every single day for the next eight years,” he said in an interview that aired on Fox News on Sunday.
A senior career U.S. official told ABC News, "He's not just taking a shot at an old CIA assessment from 14 years ago, he's disparaging and insulting every analyst currently in the intelligence community working hard to protect the United States.”
The incoming president’s remarks could be hurting the very people he will rely on when he assumes office in just over a month’s time.
“I think it would be devastating to hear that the incoming president doesn't value the intelligence that will come out of the agency. I am concerned that many of the analysts and some of the operations officers will be feeling as if there work isn't going to be valued or be heard,” Nada Bakos, a former CIA officer, told ABC News.
The public fracas has also pitted Trump against key members of Congress.
“It’s unfortunate because it undermines confidence both between the president elect and the agencies, it's not a good way to start out the relationship because this is an important relationship going forward,” Sen. Angus King (I-ME) told ABC News. “This is the president's eyes and ears.”
King, who caucuses with Democrats, was hardly alone in backing the CIA.
Referencing Trump’s pick for CIA Director, Rep. Mike Pompeo (R-KS), a senior Republican in Congress told ABC News, “Can you imagine what it is going to be like for Pompeo walking in to the CIA? He’s taking a shot at everyone in the CIA.”
Some career officials worried that CIA briefers would walk out of White House meetings after Trump is sworn-in and be criticized in tweets by the incoming president.
ABC News’ Paul Blake contributed to this report.