Following weeks of tense discussions, the spending plan is in jeopardy as the US Senate has a protracted vote on a massive budget that is essential to President Donald Trump's agenda.
The One Big Beautiful Bill Act's Republicans, who control both houses of Congress, disagree on how much to eliminate welfare programs in order to prolong tax incentives.
Elon Musk, a former close aide of Donald Trump, has once again criticized the legislation, which the president's party is rushing to approve by July 4.
The House of Representatives, which passed its own version of the bill last month by a single vote, will have to hold another vote if the proposals pass the Senate.