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 faces high stakes in meeting with Erdoğan amid impeachment drama Democrats worry they don't have right candidate to beat Trump Trump threatening to fire Mulvaney: report 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 MattisFormer Mattis staffer: Trump 'shooting himself in the foot' on foreign policy Former staffer hits back at Mattis's office over criticism of tell-all book Former speechwriter for General James Mattis: Has the national security state grappled with Donald Trump? 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.