Michael Bloomberg, the billionaire former mayor of New York, ripped President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Sunday, saying that the "past week all too perfectly exemplified" the "destructive effect on competent government" the president has had.

"There are many reasons to be optimistic about 2019," Bloomberg wrote in an op-ed for his media company, Bloomberg News. "The increasingly isolated man in the Oval Office is not one of them."

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Bloomberg, who has voiced interest about running for president as a Democrat in 2020, in the op-ed links Trump to some of the events of the past week, which included Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE's resignation and the government being forced to shut down after Congress could not agree to a spending bill.

"And in between, the stock market dove to its worst week since 2011, as investors concerned about Trump’s taste for trade wars delivered a vote of no-confidence," Bloomberg writes.

"Each of these mistakes has a common denominator: Trump’s recklessly emotional and senselessly chaotic approach to the job."

Bloomberg goes on to argue that Trump's decision to remove troops from Syria "jeopardized military success in a crucial battle and betrayed an ally as well."

He later writes that even if Trump's long-sought border wall was a good idea, "a government shutdown would be a dumb way to pursue it."

"This weekend, he imposed needless costs on government workers and on the country at large — not to accomplish anything, or to defend any principle, but to pander to the extreme wing of his party and rage at being thwarted. Republicans in Congress have gone along with this for too long," he continues.

"November should have been a wake-up call."

He concludes by saying that this past week may have given the American public a glimpse of what a collapse under Trump's style of government might look like, as well as what it may "ultimately cost us."

His strong end-of-year criticism comes as he considers whether to run for the presidency in 2020. Bloomberg has said that he plans to decide whether he'll run by January or February.