Aerial battlecruiser, fast enough to keep up with J-36s and their drone escorts in interception, using dash not supercruise, large enough to carry hypersonics, and with enough range, fuel, and AEW&C and jamming capacity to hit the US with tanker support and full J-36 + UASF escort.
This is the only way the intercontinental mission makes sense, you punch through the US defense grid where it's weakest, while maintaining fuel for escorts so you have what comes out to an Aerial Strike Group making a beeline, buddy-tanking, for DC, San Diego, etc.
The supersonic helps with air defense roles; you might have a crappy dash range, but you just need to match the J-36 supercruise, or even hang back. Then you have a large hypersonic in carry for some close range missions.
Think 6th gen Tu-160, but with flag and AEW&C capabilities.