SINGAPORE, Nov 27 — Most Asian currencies drifted today and the US dollar was flat before Jerome Powell, President Donald Trump's nominee to head the Federal Reserve, appears at a Senate confirmation hearing Senate tomorrow where his policy views will be put under a microscope.

The US dollar index, which measures the greenback against a basket of six major currencies, was flat at 0523 GMT, while US bond yields were unmoved from Friday's levels.

The US Senate Banking Committee holds a hearing tomorrow to confirm Powell to succeed Janet Yellen at the Federal Reserve.

"Apart from continuity in the Fed's stance to gradually hike rates, Powell is on board with the unwinding of the Fed's balance sheet to US$2.5-3 trillion RM10.27-12.33 trillion) from US$4.5 trillion,” DBS Group's FX Strategist Philip Wee said in a note.

"What separates Powell from (incumbent Chair Janet) Yellen is his willingness to roll back some of the banking regulations enacted during the financial crisis.”

Investors will be watching for Trump's tax reform plan as well as Powell's Congressional appearance.

Asian currencies were mixed with the South Korean won declining the most against the US dollar, weakening by 0.2 per cent, as investors took profits after the currency firmed for two straight weeks.

The won strengthened more than 1 per cent last week ahead of Bank of Korea's policy meeting on Thursday, at which the central bank is expected to raise rates by 25 basis points.

"There was quite a bit of long positioning last week in anticipation of BOK moving on interest rates,” said Wei Liang Chang, FX strategist at Mizuho Bank.

"Perhaps there are some doubts seeping in whether the BOK will be willing to move at this juncture, given the extent of won appreciation we have seen is something that's undesirable from their point of few.”

The Taiwanese dollar, baht and ringgit strengthened marginally against the US dollar.

Philippine peso

The peso firmed today after two sessions of declines against the US dollar, rising 0.2 per cent.

Wei Liang Chang said he was still cautious on the peso "even though it has shown it can move quite a fair bit in terms of trading binges.”

"We are a bit more careful because of the fact that real rates for the Philippines is one of the lowest in the region, and there are unquelled concerns that the Philippines is approaching a phase of overheating.”

Philippine central bank governor Nestor Espenilla said on Friday the country's central bank wasn't obliged to move in line with the Fed and that the central bank's primary focus "is on the inflation outlook relative to our target."

The Philippine central bank will hold a policy meeting on Dec 14.

Indian rupee

The rupee weakened slightly against the US dollar after Standard & Poor's left its "BBB-minus” sovereign rating unchanged, refusing to follow Moody's recent decision to upgrade the India's rating.

"The rating agency reiterated its BBB-rating on India with a stable outlook, indicating that the rating is unlikely to see a change in the near future,” Scotiabank said in a note. — Reuters