"Right now, there is a plan, there's a scheduled time for that [Trump-Xi meeting]," Greer told CNBC.
On Friday, Trump said that, due to the new export controls introduced by China, there appeared to be "no reason" to meet with President Xi at the upcoming APEC summit.
The two leaders are expected to meet on the sidelines of the APEC summit, which will take place from October 31-November 1.