They don‘t. At least not technically or directly.
Maybe socially when they offer cbdcs and limit access to #bitcoin legally at the same time.
That might effect the sheeple/normies a bit but at the same time the bitcoin price might skyrocket as everything forced into blackmarket gets more expensive.
He is a politician so he has no real idea what he is talking about.
https://decrypt.co/138171/cbdcs-are-designed-destroy-all-value-bitcoin-us-senator-ted-cruz