By Stanley White
TOKYO (Reuters) - The dollar edged higher against most Asian units on Monday as worries about a standoff between the United States and China over civil liberties in Hong Kong fuelled demand for safe-haven currencies.
The yuan and Australian and New Zealand dollars fell as risk-aversion hit foreign exchange markets.
Sterling was on the defensive after members of British Prime Minister Boris Johnson's party called for the resignation of an influential aide for breaking travel restrictions during the coronavirus lockdown.
A senior White House official has said Beijing's plan to impose a security law on the former British colony of Hong Kong could lead to U.S. sanctions, which could worsen an already tense relationship between the world's two-largest economies.
"The biggest concern is the tension between the United States and China," said Takuya Kanda, general manager of research at Gaitame.com Research Institute in Tokyo.
"Things were already bad, and it is likely to get worse because of the Hong Kong security law. This supports risk-off trades, which is positive for the dollar and the yen."
The dollar traded at $1.0895 against the euro (EUR=D3) on Monday in Asia, close to its strongest in a week.
The dollar bought 0.9719 Swiss franc
The greenback held steady at 107.65 yen
In onshore trade, the yuan
Trading may be subdued on Monday with financial markets in Singapore, Britain and the United States are closed for public holidays.
China's proposed national security legislation for Hong Kong could lead to U.S. sanctions and threaten the city's status as a financial hub, White House National Security Adviser Robert O'Brien said on Sunday.
Hong Kong police fired tear gas and water cannons to disperse thousands of people who rallied on Sunday to protest Beijing's national security law.
Washington and Beijing are also at loggerheads over Chinese companies' access to advanced technology and criticism of China's response after the novel coronavirus emerged late last year in Hubei.
The threat of sanctions over Hong Kong risks a repeat of last year's damaging trade war between the United States and China.
The British pound
Johnson has backed his senior adviser Dominic Cummings on Sunday, despite calls from within his own Conservative Party for the aide to resign.
Cummings, who is the architect of the 2016 campaign to leave the EU and widely considered to be Johnson's most influential strategist, came under pressure after reports he travelled to northern England from London during a nationwide lockdown in March when his wife was ill with COVID-19 symptoms.
The Australian dollar
In New South Wales, which includes the city of Sydney, children returned to full-time face-to-face learning on Monday, allowing many parents to return to offices.
Australian states are pressing ahead with a three-stage plan to remove most social restrictions imposed by July.
Across the Tasman Sea (NYSE:SE), the New Zealand dollar