NASA has been developing such a heavy lift vehicle for the better part of a decade. It's called the Space Launch System, and it's tremendously huge, capable of putting a lot of mass into space destined for the moon, and, being based on shuttle booster technology, also needlessly complex, horrendously expensive, and a one-time-use disposable solution.
In other words, it's a complete goddamned boondoggle, but there it is.
In the offing, however, SpaceX is currently building not one, but 3*! prototypes for testing their super-heavy Starship launch system, having just conducted the first hot-fire, tethered test of the Raptor engine on a non-orbital hopper prototype a couple of weeks ago. If things go as planned, SpaceX is going to be launching absolutely mind-boggling amounts of mass into space at Walmart-level costs.
Jeff Bezos also just recently unveiled that they've been working on a lunar lander for the last 3 years, and it's designed to mate up with their proposed heavy-lift New Glenn launch vehicle.
Suffice it to say, I think SLS is going to fly a couple of times, but for regular flights to the moon, there's no reason why Falcon Heavy can't be utilized for payloads smaller than Orion, and once Starship comes online, assuming it's a success, SLS will be shown to be nothing more than a shambling zombie.
*Including two orbital prototypes, and a non-orbital "hopper" for testing.




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