Earlier this month, the WHO called for all countries to work together to investigate the origins of the coronavirus that caused COVID-19. China has rejected plans for more checks on labs and markets in its territory.

Blinken met with WHO Director-General Tedros Adhanom Ghebreyesus in Kuwait City and discussed the plans for further study of the origin of the pandemic, the State Department said.

"He stressed the need for the next phase to be timely, evidence-based, transparent, expert-led, and free from interference," State Department spokesperson Ned Price said in a statement.

The first human cases of COVID-19 were reported in the central Chinese city of Wuhan in December 2019. China has repeatedly dismissed theories that the virus leaked from one of its laboratories.