Taiwan, which China views as its own territory, has been waiting for the US to approve a new arms sale package, which Reuters has reported could be worth up to $US14 billion ($A20 billion).
However, US President Donald Trump said following a May 13-15 summit with China's Xi Jinping in Beijing that he was undecided on whether to approve it.
On Thursday, US Acting Navy Secretary Hung Cao was asked at a Senate appropriations defence subcommittee hearing about future arms sales to Taiwan.
"We have done some foreign military sales to them. It's just right now we're doing a pause in order to make sure we have the munitions we need for Epic Fury - which we have plenty," he said, referring to the US operation against Iran.
"But we're just making sure we have everything, but then the foreign military sales will continue when the administration deems necessary," he said, adding it would be up to Defense Secretary Pete Hegseth and the Secretary of State Marco Rubio on whether to approve the sales to Taiwan.
Speaking to reporters in Taipei, Taiwan Presidential Office spokesman Karen Kuo said they had noted the remarks.
"However, at present we have not received any relevant information about the US adjusting these military sales," she said.
Taiwan's defence ministry said it also had not received any notification of arms sales delays.
The ministry continues to "monitor US security cooperation policy" and maintain close co-ordination and communication with the US to ensure that arms sales proceed according to plan, it said in a statement.
The US is bound by law to provide Taiwan with the means to defend itself. China has repeatedly called for the US to stop arms sales.
Taiwan's government rejects Beijing's sovereignty claims, saying only the Taiwanese people can decide their future.
