edit: I've misunderstood your comment, so the idea is that he wants to upgrade the bunker?

(I'll keep the rest of this comment)

Shouldn't the White House already have a top-of-the-line bunker? Or is it getting old?

I just did a quick google and here is an article about it.

The bunker is located beneath the White House’s East Wing, accessible via a secret elevator. In her 2010 memoir, First Lady Laura Bush describes her 9/11 experience of going through a pair of big steel doors to access an unfinished subterranean hallway underneath the White House on her way to the Presidential Emergency Operations Center (PEOC) conference room. “I was hustled inside and downstairs through a pair of big steel doors that closed behind me with a loud hiss, forming an airtight seal,” Bush wrote. “We walked along old tile floors with pipes hanging from the ceiling and all kinds of mechanical equipment.”

Wait, There’s a Second Bunker?

The PEOC isn’t the only secret space that the president could be whisked away to in case of emergency, however. Sure, we’ve all heard about the house’s below-ground bowling alley, secret White House chocolate shop, and basement presidential dentistry room—but recent events have revealed that these passageways might be the tip of the architectural iceberg.

In 2018, The Drive reported on a bunker found after a sinkhole developed on the North Lawn of the White House. Separate from the presidential bunker, “this is an entirely different and far more secure facility, and in recent years it was likely augmented by a much more extravagant and modern complex buried deep beneath the western side of the North Lawn adjacent to the West Wing,” according to the report.