US official cited by Reuters

  • Trump's decision on whether to impose more tariffs on Chinese goods depends on meeting with Xi, nothing agreed ahead of time
  • Unlikely US would agree to lift restrictions on Huawei

From China's perspective, it would make sense that Xi wouldn't agree to meet without assurances that more sanctions wouldn't be applied. If Trump walks out of the meeting and hits the US with a fresh round, it would reflect poorly on the leader. In general, these things are always agreed on ahead of time, with room for tweaks.