President Donald Trump said the USA can "totally" address North Korea's nuclear threat unilaterally if China doesn't cooperate to put pressure on that nation, according to the Financial Times.
Beijing fears a potential North Korean collapse, which would result in "a unified Korea allied with the United States on their border", Carter said.
The Chinese have urged Washington to de-escalate tensions with Pyongyang and to find a way to restart negotiations, but US officials say it would be premature to resume talks now because it would be seen as a reward to North Korea for bad behavior.
The U.S. official said Trump may warn Xi of such moves, including efforts to beef up South Korean and Japanese anti-missile defenses - something Beijing strongly opposes.
He said Washington should continue to pressure China to lean on North Korea, but he was not optimistic that would lead to anything.
The US president told the Financial Times in an interview published on Sunday that he plans to bring up North Korea during his summit with Xi on Thursday and Friday at his Mar-a-Lago resort, emphasizing that China has "great influence" over Pyongyang.
The chief USA concern is North Korea's efforts to develop an intercontinental nuclear missile that could carry a nuclear warhead and be capable of hitting the United States.
Trump, who declared China the "grand champion" of currency manipulation and has called himself a tough negotiator, will face his first real test on trade.
The president also indicated that he would postpone a discussion with the Chinese president on tariffs until "perhaps the next time we meet".
United Nations resolutions have failed so far to deter North Korea from conducting nuclear and missile tests. "We´re going to continue to put pressure on China to have action".
But he said a U.S. strike on North Korea would likely trigger a North Korean attempt to invade South Korea.
But Haley emphasized that at the Florida meeting "the most important conversation will be how we´re going to be dealing with the nonproliferation of North Korea".
Dennis Wilder, a former CIA China analyst, tried to shed some light on what exactly Trump meant with these cryptic statement.
"I've been working on the North Korea problem since 1994", Carter said on ABC. When pressed about whether he could do it one-on-one without China's help, the president said, "I don't have to say any more". If you would like to discuss another topic, look for a relevant article.
Be proactive - Use the "Flag as Inappropriate" link at the upper right corner of each comment to let us know of abusive posts.