US President Donald Trump said Sunday that the military is constructing a "massive complex" beneath a planned White House ballroom, which he said will feature bulletproof glass and drone-proof protections while being funded entirely by private donors.

Axar.az reports, citing Fox news, the project, which Trump said is designed to accommodate large events and visiting dignitaries, would expand capacity at the White House, where he said existing rooms are too small for major gatherings.

"The military is building a massive complex under the ballroom, and that’s under construction, and we’re doing very well," Trump said.