White House aides are considering undermining the Hong Kong dollar's peg to the greenback as part of efforts to punish China over its new security law in the city, a report said Wednesday. Bloomberg News said the idea from some officials to put a strain on the 37-year-old peg -- possibly by limiting local banks' access to US dollars -- was one of a number of measures flagged as Washington looks at ways to respond to the controversial law. Other measures being discussed included cancelling a US-Hong Kong extradition treaty and no longer cooperating with the city's police force, Bloomberg said.