Moody’s Investor Service said Wednesday it has downgraded its short-term rating on Citigroup to Prime-2 from Prime-1.

Moody’s cited “a decrease in the probability that the US government would support the bank, if needed.”

On the other hand, Moody’s noted an improvement in Citibank’s stand-alone credit profile, and said Citigroup’s liquidity profile has been “strengthened significantly in the past two years and is robust.”

Given those factors, Moody’s confirmed Citigroup’s long-term rating of A3 and its Prime-1 short-term rating on Citibank N.A.

Moody’s also downgraded Bank of America and Wells Fargo Wednesday.

To read more, go to MarketWatch.com.