WASHINGTON (REUTERS) - US Secretary of State Mike Pompeo took fresh aim at China over the coronavirus on Wednesday (May 20), calling the US$2 billion (S$2.8 billion) that Beijing has pledged to fight the pandemic "paltry" compared to the hundreds of thousands of lives lost and trillions of dollars of damage.

Pompeo rejected Chinese President Xi Jinping's claim that Beijing had acted with transparency after the outbreak in China, and said if Xi wanted to show that, he should hold a news conference and allow reporters to ask him anything they liked.

"President Xi claimed this week that China is acting with openness, transparency responsibility. I wish it were so," Pompeo told a State Department news conference, charging that Beijing continued to withhold virus samples and access to facilities, to censor discussion, "and much, much more."

US-China tensions have spiked in recent weeks, with Pompeo and President Donald Trump slamming Beijing's handling of the outbreak.

The United States has been hardest hit in the global pandemic.

At a time when many nations worldwide are urging for unity and cooperation to ramp up the fight against the virus, Trump has proposed quitting the World Health Organisation over its response and called it a "puppet of China," while Xi has pledged it US$2 billion.

"I look forward to seeing them fulfil that US$2 billion commitment," Pompeo said.

"China's contributions to fighting the pandemic are paltry compared to the cost that they have imposed on the world."

"This plague has cost roughly 90,000 American lives, more than 36 million Americans have lost their jobs since March; globally 300,000 lives. Could be as much as US$9 trillion, according to our estimates, cost imposition on the world of the Chinese Communist Party's failures," Pompeo said.

He accused China of threatening Australia with "economic retribution" for seeking an independent inquiry into the outbreak's origins and charged that WHO director-general Tedros Adhanom Ghebreyesus had had "unusually close ties to Beijing... long before this current pandemic," something "deeply troubling."

The WHO and the Chinese embassy in Washington did not immediately respond to a request for comment on Pompeo's accusations.