"I predict he will also once again say to the prime minister that he's committed to getting TPP done and doing so before the end of his term," Kritenbrink told reporters on Friday.

"TPP is going to be great for the American economy, for American workers and American companies," Kritenbrink said, noting Singapore, a signatory to the deal, strongly supports it.

Trump has argued vociferously against multinational trade deals like TPP, saying he would prefer instead to have deals with specific countries one on one. On Thursday night at a rally in Cedar Rapids, Iowa, Trump said TPP should be rejected.

"I like trade where the United States makes a lot of money," he said.

Trump has been critical of Clinton, Obama's former secretary of state, and her vice presidential running mate Tim Kaine, for shifting their positions to oppose the trade deal.

Signs protesting the deal were prominent during the Democratic convention, which wrapped up on Thursday.

Kaine, a Democratic senator who had praised the TPP deal until he joined Clinton's ticket, told CNN on Friday that he was concerned the deal gives corporations the power to challenge trade practices, but not unions or environmental groups.