A scandal over the US$11.6 billion (S$15.9 billion) of debt wracked up by state fund 1MDB had been bubbling for months, with Malaysia's longest serving leader, former prime minister Mahathir Mohamed, making repeated calls for Mr Najib to step down while asking where the money had gone.
But a Wall Street Journal report on Friday sent shockwaves through Malaysia and financial markets by alleging nearly US$700 million was transferred into bank accounts believed to belong to Mr Najib.
Mr Najib has denied taking any money from the debt-laden state fund or any other entity for personal gain. "The political drama is unlikely to be fixed overnight. It will continue and put the ringgit under pressure," said Lee Jin-yang, a macro analyst at Aberdeen Asset Management in Singapore. "The ringgit is likely to face additional headwinds from broader U.S. dollar strength and weak oil price as well," Mr Lee said.
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He, like many other traders, did not see any quick reversal of fortunes for the ringgit.
The 3.8000 level remains a strong psychological reference point for Malaysians, even though the central bank brought the currency off the peg 10 years ago.
Technical analysts have a more dispassionate perspective, and they see the ringgit gathering chart support between 3.8000 and 3.8200 - marking the 38.2 percent Fibonacci retracement of its depreciation from 1978 to 1998.
If the support level is breached, the ringgit may weaken to 3.9060, the 50 percent retracement of its appreciation from 1998 to 2011, they said.
Political risk had remained a background factor until recently, but the ringgit was already weighed down by worries about the impact of weak global prices on its oil and gas earnings.
It is Asia's weakest performing currency this year, having fallen 8.1 percent against the dollar.
Yet last week, Fitch Ratings somewhat unexpectedly opted to switch its outlook on the rating to "stable" from "negative".