"The legislation worth $118bn agreed on Sunday by Democratic and Republican negotiators in the Senate could be the last chance for the Biden administration to secure new military support for Ukraine in its defence against Russia's invasion " alongside other national security goals including aid to Israel and Taiwan.
It also marks a rare compromise on efforts to curb immigration through the border with Mexico, including restrictions on asylum, which has been a rallying cry for Republicans and a political liability for Democrats throughout Biden's presidency.
But the bipartisan dealmaking has been trashed by Trump in recent weeks " and the frontrunner for this year's Republican White House nomination moved to torpedo the latest breakthrough again this week.
"He'd rather weaponise this issue than actually solve it," Biden said of his predecessor from the state dining room of the White House on Tuesday.
"For the last 24 hours, he's done nothing at all but reach out to Republicans in the House and the Senate and threaten them and try to intimidate them to vote against this proposal. And it looks like they're caving," the president added.
Failure to pass the bill would mean "fewer tools" for Ukraine to fight Russia's invasion and that was "just what [Vladimir] Putin wants", Biden added, referring to Russia's president.
"History is watching. A failure to support Ukraine at this critical moment will never be forgotten."
On Monday, Trump had bashed the agreement on social media, calling it a "great gift" for Democrats and a "death wish" for Republicans.
"It takes the HORRIBLE JOB the Democrats have done on Immigration and the Border, absolves them, and puts it all squarely on the shoulders of Republicans. Don't be STUPID!!!", he wrote.
Trump's opposition to the compromise bill has led Republicans who control the majority in the House of Representatives to call the legislation a "waste of time" and "dead on arrival" in the lower chamber.
Instead of considering the bipartisan package, the House was planning to vote on a bill to only fund aid for Israel, and a vote to impeach Alejandro Mayorkas, the homeland security secretary, over his handling of immigration."
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Republicans are Trump Tools... and enemies of the People.