A bipartisan US Senate group has unveiled plans for a $118bn (£93.4bn) package for Ukraine, Israel, and American border security.
Both houses of Congress need to pass it - and funding for Ukraine has been stalled thus far by hardline Republicans.
Top Senate Republican Mitch McConnell has encouraged his party to back the deal, saying they would not get a better one even under a Republican White House.
But House of Representatives speaker Mike Johnson declared it "dead on arrival" if it reached his chamber.
"This bill is even worse than we expected, and won't come close to ending the border catastrophe the president has created."
Senate majority leader Chuck Schumer said he would take steps to hold an initial vote on Wednesday.
The deal includes:
- $60.06bn for Ukraine's war effort
- $10bn for humanitarian assistance in Ukraine, Gaza and the West Bank
- $14.1bn in security assistance for Israel
- $2.44bn to US Central Command and the conflict in the Red Sea
- $4.83bn for US partners in the Indo-Pacific facing aggression from China
- $20.23bn for border security
Explained: Ukraine relies heavily on two sources of financial and military assistance - the EU and the US.
As of December, the EU and its countries had committed $143bn in support (which excludes its latest $54bn deal), followed by the US with $76bn, according to the Kiel Institute for the World Economy.
The rest of the world donated a little under $40bn.
Most of the aid given by the US is in military support, while the EU has offered the majority of its assistance in financial support.
