By Wayne Cole

SYDNEY, April 29 (Reuters) - The Australian and New Zealand dollars were making another attempt at topside resistance on Tuesday as conflicting comments over White House tariff policies undermined confidence in their U.S. counterpart.

Markets were jolted when U.S. Treasury Secretary Scott Bessent said it was up to China to "de-escalate" the trade war, a reversal from last week when President Donald Trump suggested the U.S. would scale back its tariffs first.

"The implementation of U.S. tariff policy has been erratic and, as a consequence, uncertainty about the business environment is very high," said Joseph Capurso, head of international economics at CBA.

"While the end-state remains unclear, the significant increase in U.S. tariffs will stunt economic growth in the U.S. and most large economies."

Data due on Wednesday could show the U.S. economy had already contracted in the first quarter, partly due to a surge in imports ahead of the tariffs.

Investors reacted by pushing the greenback down across the board, lifting the Aussie back to $0.6429 AUD=D3 from a Monday low of $0.6369. It now faces major resistance around $0.6439 which defeated repeated attempts to rally last week and a bullish break would open to way to at least $0.6550.

The kiwi dollar managed a more modest bounce before selling curbed it at $0.5963 NZD=D3, well short of its recent top at $0.6029.

Data out of New Zealand suggested the labour market remained subdued and markets were right to price in a 90% chance the Reserve Bank of New Zealand would again cut rates at its next policy meeting on May 28. 0#NZDIRPR

"The data shows that jobs were about flat over the March quarter and, in the context of a growing working-age population, that suggests a further rise in the unemployment rate is likely," said Michael Gordon, a senior economist at Westpac.

Markets are fully priced for the Reserve Bank of Australia to cut the 4.10% cash rate by 25 basis points when it meets on May 20, though inflation figures due on Wednesday might just alter the equation.

Forecasts are for the key trimmed mean measure of core inflation to rise 0.6% in the first quarter, pulling the annual pace down to 2.8% from 3.2%.

That would put it back in the RBA's 2% to 3% target band for the first time since late 2021 and greatly strengthen the case for an easing next month.

(Reporting by Wayne ColeEditing by Shri Navaratnam)

((Wayne.Cole@thomsonreuters.com; 612 9171 7144; Reuters Messaging: wayne.cole.thomsonreuters.com@reuters.net))