Ok, the Congressman is a fool.
If the US Government decided to go balls to the wall and destroy bitcoin, then sorry bitcoin will die.
1. They could confiscate all bitcoins in the US and crash the markets.
3. They could send in special forces covertly and destroy all ASICS warehouses, with explosives.
4. They could just compromise the 4 mining pool operators and make them double spend and freeze all new transactions.
5. They could just threaten to bomb anyone that mines bitcoin.
Realize that if the decision to use force is ever on the table, then bitcoin is dead.
Which likely will not happen, just in your fantasy. That's an abuse of power and more likely an act of terrorism rather than a government, the US is a democratic country, not communism. They can't confiscate all bitcoins in the US without enough reasons to do so, just because they can don't mean they will.
Keep the hallucinations in your mind, don't mention it here, all of it is crap.