House Speaker Nancy Pelosi and Senate Republicans on Saturday balked at President Donald Trump's roughly $1.8 trillion stimulus proposal, making it all but certain Congress won't pass an economic relief package before Election Day.

On Saturday, Pelosi called the counteroffer Trump made Friday "insufficient" and "amounted to one step forward, two steps back" in negotiations, underscoring that there are several major outstanding policy issues to work out.

"At this point, we still have disagreement on many priorities, and Democrats are awaiting language from the Administration on several provisions as the negotiations on the overall funding amount continue," Pelosi wrote in a letter Saturday to House Democrats.

Pelosi's cool reception to the $1.8 trillion offer from Trump -- the administration's highest offer thus far in the months-long talks -- comes as Republicans have made clear to their respective leaders they want no part of a deal this big, which Senate Leader Mitch McConnell and House Minority Leader Kevin McCarthy have communicated to the White House.

In a conference call Saturday with Treasury Secretary Steven Mnuchin and White House chief of staff Mark Meadows, Senate Republicans blasted the offer the White House made to Speaker Pelosi, according to multiple sources.

They went through a number of GOP concerns, like state and local funding, as well as the overall price tag.

(With input from agencies)