By Agence France-Presse
Traders sent regional equities surging on Thursday and Friday as it emerged that Treasury Secretary Steven Mnuchin had offered to meet officials from Beijing to avert an all-out trade war.
However, The Washington Post and Wall Street Journal said the president had decided to impose 10 percent levies on $200 billion of Chinese imports and could make an announcement in the coming days.
That would come on top of the $50 billion already announced over the summer and would account for about half of China's exports to the United States. Beijing has threatened to retaliate to any measures.
"Whether this is little more than the president using this leverage as a negotiating tactic, China officials will continue to be frustrated," said Stephen Innes, head of Asia-Pacific trading at OANDA.
"This good cop bad cop routine continues to undermine Mr Mnuchin's efforts as it's still not clear if anyone other the Trump himself is commissioned to cut a deal. And not too unexpectedly, and quite ominously, China could cancel the meeting."
Hong Kong led losses Monday, dropping 1.6 percent while Shanghai was 0.8 percent off. Seoul and Singapore each lost 0.7 percent, while Wellington and Taipei also saw deep losses but Sydney edged 0.3 percent higher.
Tokyo was closed for a public holiday.
However, while investors were in a selling mood JP Morgan Asset Management global market strategist Kerry Craig said some positives could be taken from the fact Trump is said to be considering 10 percent tariffs, rather than the feared 25 percent.
"No more tariffs would still be the best outcome for the markets but with the US administration seemingly wanting to pursue its longer term strategic agenda against China, that's unlikely to be the case, especially as there is little in the way of pain being felt by the US economy or equity market, he said.
"Timing is also important when it comes to enacting any new tariffs. A staggered implementation is being the viewed as the best of a bad situation."
Key figures around 0300 GMT
Hong Kong - Hang Seng: DOWN 1.6 percent at 26,850.27
Shanghai - Composite: DOWN 0.8 percent at 2,661.03
Tokyo - Nikkei 225: Closed for a public holiday
Euro/dollar: UP at $1.1633 from $1.1627 at 2030 GMT on Friday
Pound/dollar: UP at $1.3075 from $1.3069
Dollar/yen: UP at 112.05 yen from 112.00 yen
Oil - West Texas Intermediate: DOWN nine cents at $68.90 per barrel
Oil - Brent Crude: DOWN four cents at $78.05 per barrel
New York - Dow Jones: FLAT at 26,154.67 (close)
London - FTSE 100: UP 0.3 percent at 7,304.04 (close).