The Biden administration is urgently negotiating with Congress to secure authorization for the use of $6 billion in defense aid for Ukraine. The issue must be resolved by September 30, the deadline for this funding, according to Reuters. The Biden administration’s Presidential Drawdown Authority (PDA), a key component of the $61 billion aid package approved in April, allows the US President to transfer defense goods and services from US stocks in response to emergencies. This PDA has been the primary mechanism through which the Biden administration has delivered weapons to Ukraine, Reuters rep…