There isn't any actual law compelling him to disclose his tax returns, now mayber you meant 'Bullshit subpoena that the DemonRats elected not to litigate in court'...
Sending a ridiculous budget to the Senate would backfire, since the Constitution only requires spending bills originate in the House, it does not mean the Senate has to pass the same bill, they can put whatever they want in it and then it has to go to Reconciliation, which would blow up on your dumb DemonRat asses because it puts the onus back on the House for being the sphincter, especially if the Senate lards it up with all the shit that everybody wants.
Not passing a budget at all would not be unusual for a House under Pelosi, it's more like the norm. She's been remarkably inept, or partisan by turns, in accomplishing this basic duty of her office practically every year she's been Speaker.