Former White House ethics chief Walter ShaubWalter Michael ShaubPence lands in controversy with stay at Trump hotel Ex-ethics chief rips Trump July 4 event as 'taxpayer-funded campaign ad' Here are the top paid White House staffers MORE said Sunday that the “disintegration” of the Trump administration “is accelerating,” warning that “you haven’t seen anything yet.”

“The disintegration of this administration is accelerating,” Shaub, a prominent critic of President TrumpDonald John TrumpTrump says his advice to impeachment defense team is 'just be honest' Trump expands tariffs on steel and aluminum imports CNN's Axelrod says impeachment didn't come up until 80 minutes into focus group MORE, tweeted.

“This was inevitable from the day he refused to divest his conflicting interests & confirmed that his presidency would have nothing to do with public service,” he added.

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“If you think this week was crazy, you haven’t seen anything yet.”

Shaub’s tweet follows a week of turmoil in Washington that culminated in the departure of top Defense officials and a Christmas partial government shutdown. The former ethics official publicly clashed with Trump over his business interests before resigning in the first months of Trump's presidency, and recently joined federal ethics watchdog group Citizens for Responsibility and Ethics in Washington.

After Trump announced an unexpected plan to pull remaining U.S. troops out of Syria, declaring that “we defeated ISIS,” Defense Secretary James MattisJames Norman MattisLawmakers push back at Pentagon's possible Africa drawdown Overnight Defense: Book says Trump called military leaders 'dopes and babies' | House reinvites Pompeo for Iran hearing | Dems urge Esper to reject border wall funding request Trump called top military brass 'a bunch of dopes and babies' in 2017: book MORE resigned, followed by Brett McGurk, the presidential envoy to the fight against the Islamic State in Iraq and Syria (ISIS).

And lawmakers failed to reach a deal to fund the government past the Dec. 21 deadline, sending the government into a partial shutdown set to last through Christmas.

The impasse was centered around Trump’s demands for borer security funding, with the White House standing by its demand for $5 billion in funding for a U.S.-Mexico border wall.