As The Hill emphasizes, this came literally "moments after the Senate sent a $40 billion supplemental aid package to the president's desk." More, more, more will now be the order of business, the American taxpayer and debt placed on their children's children be damned.
The news of the fresh additional $100 million came as part of the same statement wherein the president hailed Congressional passage of the $40 billion. Biden said in a written statement the US has already provided a "historic" amount of security assistance to Ukraine to date.
He detailed what the new $100 million is expected to deliver: "...I am announcing another package of security assistance that will provide additional artillery, radars, and other equipment to Ukraine, which they are already using so effectively on the battlefield."
He described further, "These weapons and equipment will go directly to the front lines of freedom in Ukraine, and reiterate our strong support for the brave people of Ukraine as they defend their country against Russia's ongoing aggression."
Separately Secretary of State Antony Blinken noted:
In a separate statement, Secretary of State Antony Blinken said the weapons will be coming from the Pentagon's existing inventories.
This despite that already over the last month Congressional leaders and defense officials have raided concern over depleted US defense supplies, especially items like anti-tank missiles.