After months of delay, the House of Representatives is due to vote on tens of billions of dollars in US military aid for Ukraine and Israel.
Both measures have vocal opponents in Congress, and their hopes of passage have hinged on a fragile bipartisan coalition to overcome legislative hurdles.
A procedural vote on Thursday gave a strong indication the votes will pass.
House Speaker Mike Johnson says he wants to push the measures through, even if it jeopardises his position.
The Ukraine vote will be closely watched in Kyiv, which has warned of an urgent need for fresh support from its allies as Russia makes steady gains on the battlefield.
If the House passes the bills, the Senate may approve the package as soon as this weekend.
President Joe Biden has pledged to sign it into law.
Whatever passes will be combined into one bill that will then have to be approved as a whole by the Senate before it reaches the president’s desk.