The idea of holding the event at Trump's resort has been criticized by government ethics watchdogs.

U.S. President Donald Trump’s only regret in hiking tariffs on China is that he didn’t raise them higher, his press secretary said Sunday after the president had earlier signaled some remorse for an escalating trade war with China.

Trump, who aides say has little interest in multilateralism, twice attacked Canadian Prime Minister Justin Trudeau on Twitter on Thursday and officials concede the mood is likely to be exceptionally tense.