WASHINGTON — A raft of drone sightings in New Jersey and other US states has underscored gaps in US airspace security that need to be closed, President-elect Donald Trump's pick for national security adviser, Mike Waltz, said on Sunday (Dec 15).

President Joe Biden's outgoing administration has played down concerns about a growing number of reported drone sightings, saying most of them involve manned aircraft and stressing that there is no evidence of any national security threat.

But US lawmakers, including some of Biden's fellow Democrats, have expressed frustration that the government is not being more transparent and more aggressive in addressing public concerns.

Waltz said Americans were growing frustrated with the failure of Biden's administration to clarify what information they have on the drone reports.

"What the drone issue points out are kind of gaps in our agencies, gaps in our authorities between the Department of Homeland Security, local law enforcement, the Defence Department," Waltz told CBS News' Face the Nation.

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