The US hopes China - North Korea's largest trading partner - can apply pressure to Pyongyang to curtail its nuclear ambitions.
McMaster was speaking hours after US and South Korean defense officials told CNN that an attempted missile launch by North Korea failed.
"I don't know why we have to be bound by a One-China policy unless we make a deal with China having to do with other things, including trade", Trump said in an interview on Fox News Sunday in December.
One week ago today, the Chinese and U.S. presidents were wrapping up their meetings in Palm Beach, Florida.
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The declaration also came days after Trump - in a turnabout from his campaign stance - declared in an interview that his administration would not label China a currency manipulator, which could have triggered investigations. His comments echo those of a White House official earlier this month, who said "the clock has now run out, and all options are on the table" in regard to the rogue nation.
North Korea's ultimate goal is to have a full array of nuclear-tipped missiles in response to what Pyongyang says is hostility by Washington and Seoul meant to topple its government.
South Korean and U.S. intelligence officials are trying to determine what type of missile was used Sunday, but initial reports said it could be a medium-range missile, according to a White House foreign policy adviser.
The extended-range Scud missile in that earlier launch suffered an in-flight failure and fell into the sea off North Korea's east coast, according to US imagery and assessments.
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Another missile test from Sinpo failed earlier this month, when the rocket spun out of control and plunged into the ocean. So really, no need to reinforce their failure. "Whether they're currency manipulators or not, we should expect them to act to prevent what could be a cataclysmic event".
Asked what U.S. policy on China's currency has to do with North Korea, Senator John McCain said "it may be part of the overall relationship" between the United States and Beijing. "We will see what happens!" he tweeted. In a statement, Defense Secretary Jim Mattis said Trump and his military team "are aware of North Korea's most recent unsuccessful missile launch". North Korea relies heavily on China for food and fuel and the vast majority of its exports go through China.
"Not only did they establish a very warm relationship, but since that time, they've worked together on other issues", McMaster said, referring to Trump and Xi.
North Korean men play shooting games at while a school boy watches at the Central Zoo on Sunday, April 16, 2017, in Pyongyang, North Korea.
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