Neither President Trump nor Chinese President Xi Jinping are showing any sign they’ll cave in the escalating trade dispute between the world’s two most important economics, portending a standoff that could last months or even years.

Buoyed by the strong U.S. economy, Trump is feeling little pressure to strike a quick deal with Beijing and people close to the White House say he is prepared to hold out for the best possible deal.

“President Trump is not planning on backing down on this issue until he gets a result that addresses the longstanding, unfair trade practices the Chinese are engaging in,” said Clete Willems, a former top White House trade negotiator who recently left his post. “President Trump is going to see this one through until the end.”