[avitalporatova]

Please show where the Constitution says that signed Bills are required to be returned to Congress. Once presented to the POTUS, Congress' job is done.

Here is what the supreme court decided in LA ABRA SILVER MINING CO. V. UNITED STATES, 175 U. S. 423 (1899)

Whether the President can sign a bill after the final adjournment of Congress for the session is a question not arising in this case, and has not been considered or decided by us.