The dollar recouped some ground after dipping to a two-week low against the yen in Asian trading on Monday, but it lacked momentum as investors awaited this week's speech by US President Donald Trump for clues on tax reform.

Trump will make his first major policy address to Congress on Tuesday. It is expected to include some details of his infrastructure spending and tax plans, but some market participants worry that a lack of fresh direction could disappoint investors and weigh on the dollar.

Treasury Secretary Steven Mnuchin had said in a televised interview on Sunday that Trump will use the event to preview some elements of his sweeping plans to cut taxes for the middle class, simplify the tax system and make American companies more globally competitive with lower rates and changes to encourage US manufacturing.

The dollar added 0.2 per cent to 112.20 yen JPY=, after falling as low as 111.920 yen earlier in the session, its lowest since February 9.

The euro was steady on the day at $1.0562, as concerns about France's upcoming election continued to weigh on the single currency.

While current polls show National Front leader Marine Le Pen losing either to centrist Emmanuel Macron or right-wing Francois Fillon, investors have not counted her out, and many fear that she could lead France out of the euro zone.

"The dominant themes now are Trump's tax plan, and the French elections," said Masafumi Yamamoto, chief forex strategist at Mizuho Securities.

"I think ahead of Trump's speech, the dollar is likely to again fall below 112," he said. "What surprises me today is the weakness of sterling. The Scots want to have another referendum, so probably that is weighing on sterling."

Sterling skidded 0.4 per cent to $1.2425.

The dollar index, which tracks the US unit against a basket of six major rivals, benefited from sterling's weakness and edged up 0.1 per cent to 101.16.

The Scottish government is increasingly confident it can win a new independence referendum and is considering calling one next year as Britain exits the European Union, sources close to the Edinburgh administration say.

"Some people might say that the Scottish developments might lead to a stronger yen," which typically benefits from investors' risk aversion, said Masashi Murata, senior currency strategist at Brown Brothers Harriman in Tokyo.

"But I don't think so, because with the stronger global economy, not so many people would like to sell the dollar, and also the French presidential election is not a reason to buy the yen, either," he said. "My sense is that the dollar is stable for now."

Lower US Treasury yields have weighed on the greenback in recent weeks.

The yield on the benchmark US 10-year note dropped to five-week lows last week. It stood at 2.331 per cent on Monday, compared with Friday's US close of 2.317 per cent.

Putting pressure on US yields, economic data on Friday showed new home sales grew less than expected in January. Consumer sentiment weakened, though it remained at a level consistent with a healthy pace of consumer spending.

But speculators have not counted the dollar out. They increased bullish bets on the US dollar for the first time in seven weeks, according to Commodity Futures Trading Commission data released on Friday and calculations by Reuters.

The value of the dollar's net long position totalled $15.02 billion in the week ended February. 21, up from $14.99 billion the previous week.

The CFTC data also showed net shorts of 50,162 Japanese yen contracts, the lowest in more than two months.

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