The White House asked Congress on Friday for $6.4 billion to aid Ukraine as it fends off a Russian invasion, including $3.5 billion in Pentagon funding and $2.9 billion for foreign security and humanitarian assistance.

The Biden administration’s request comes as lawmakers from both parties call for a substantial increase in emergency aid to Ukraine, which came under siege this week from Russian forces. Sen. Chris Coons (D-Del.), who chairs the spending panel that funds the State Department and foreign operations, predicted earlier Friday that at least $10 billion would be needed amid an impending refugee crisis in eastern Europe.