"If the North Koreans want to meet, we'll be there," White House press secretary Sarah Sanders told journalists, adding that the White House schedule had not changed.
"The president is prepared and will be ready to meet, and we're continuing to move forward with the preparations at this point."
After weeks of warm words and diplomatic backslapping, Pyongyang on Tuesday abruptly threatened to pull out of the planned June 12 summit, blaming US demands for "unilateral nuclear abandonment."
Sanders, however, said North Korea was "not in the driver's seat. Nothing could be further from the truth."
"They're the ones that extended the invitation. If they're happy to meet, we're happy to do that," she added.