The British pound fell on Tuesday after reports United Kingdom (UK) Prime Minister Boris Johnson was seeking a hard line on Britain's transition period after Brexit, while the Australian dollar dropped on a downbeat tone from the nation's central bank.

Sterling dropped as much as 0.7 per cent to $1.3236, as its Friday's 1-1/2-year peak of $1.3516 looked increasingly like a near-term peak following the massive relief rally after last week's UK election.

Johnson's revised Withdrawal Agreement Bill would require the United Kingdom to have arrangements to leave the European Union (EU) be in place by December 31 next year, media reports said.

The move dashes hopes Johnson would take a flexible approach to the end-2020 deadline for a trade deal with the EU after Britain leaves the bloc, which now looks almost certain to happen on January 31 following the landslide Conservative election win.

“Common sense suggests that crafting a trade deal would take at least more than a year, so markets had assumed that the transition period will be extended,” said Masafumi Yamamoto, chief currency strategist at Mizuho Securities.

“It seems like the big majority Johnson won is enabling him to take a hard line approach, which the market doesn't like so much. Considering the UK economy looks set to deteriorate as people and companies start to leave the country because of Brexit, sterling's short-covering rally is over,” he added.

The pound last stood at $1.3286, down 0.3 per cent from the late United States (US) levels.

The Australian dollar lost 0.2 per cent to $0.6868 after the Reserve Bank of Australia opened the door to another cut in interest rates as early as February, should household incomes stay depressed or the labour market takes a turn for the worse.

Minutes of its December policy meeting out on Tuesday, showed the central bank's board was concerned that wage growth was too weak to revive either inflation or consumption.

Other major currencies saw limited moves as investors sought more details on an interim trade deal the United States and China struck last week. The deal has broadly capped safe-haven currencies, such as the yen, and supported risk-sensitive currencies.

Against the yen, the dollar traded at 109.56 yen, up 0.05 per cent from late US levels, having gained 0.15 per cent on Monday to edge near six-month high of 109.73 hit on December 2.

The euro stood at $1.1147, maintaining its uptrend from its seven-week low of $1.1098 touched on November 29.

The deal, announced on Friday after more than two-and-a-half years of volatile negotiations between Washington and Beijing, will reduce some US tariffs on Chinese goods in exchange for increased Chinese purchases of some US goods.

“There is some scepticism, but on the whole, the deal is likely to lift corporate sentiment. Even though we may not see lively market moves in coming couple of weeks due to holiday seasons, we are likely to see gradual rise in risk assets,” said Masaru Ishibashi, joint general manager of trading at Sumitomo Mitsui Bank.

“Some emerging market currencies are already starting to price that in,” he added.

The Mexican peso rose to a five-month high of 18.921 per dollar, also helped by a new trade deal with the United States and Canada signed last week to replace the 1994 North American Free Trade Agreement (NAFTA).

Economic data from the United States also underpinned the improved mood around the global economy.

Data out on Monday showed the US economy remained robust, with US homebuilder sentiment surging to its most optimistic reading in more than 20 years, way past market expectations for a flat reading.

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