The United States continues to support Tokyo's plan to hold the Summer Olympics with an expectation of strict protocols to protect visiting athletes amid the coronavirus pandemic, the White House said Tuesday, a day after the State Department issued an advisory against traveling to Japan.

"Our position has not changed on the Olympics," White House Press Secretary Jen Psaki told a press conference, noting the Japanese government's assurances that "public health remains the central priority" in plans for hosting the games.

The United States sent ripples across Japan by raising its travel advisory to the Asian country to the highest level of 4 on Monday due to a rise in coronavirus cases, just two months before the start of the Tokyo Olympics.

White House Press Secretary Jen Psaki participates in a White House press briefing at the James Brady Press Briefing Room of the White House on Jan. 22, 2021 in Washington. (Getty/Kyodo)  

The U.S. Centers for Disease Control and Prevention, whose assessment was reflected in the "do not travel" advisory, has described the situation in Japan as potentially putting even fully vaccinated travelers at risk for getting and spreading COVID-19 variants.

Psaki said U.S. athletes heading to Japan are among "one of the very limited categories of U.S. travelers that are actually planning on going to Japan for the Olympics."

"There are very specific entry and movement rules and procedures which the organizers have laid out to ensure the protection of everyone involved," she added.

Questions have continued to be raised within and beyond Japan as to whether the Tokyo Olympics, already delayed by one year due to the pandemic, should go ahead.

Tokyo, Osaka and several other prefectures have been under a state of emergency since late April due to a resurgence in infections, while the public has been frustrated with the government's handling of the coronavirus for months, including its slow vaccination rollout compared to other developed countries.

Media polls have also shown that a large majority of people in Japan are not supportive of staging the global sporting event this summer in the capital.

U.S. President Joe Biden expressed support for Japanese Prime Minister Yoshihide Suga's efforts to hold a "safe and secure" Olympic and Paralympic Games when the two met in mid-April, according to a joint statement released after their talks.