Sen. Susan Collins (R-Maine) said Sunday that infrastructure negotiations between Senate Republicans and the White House are "the test" that "will determine whether ... we can work together in a bipartisan way on an important issue."

She told ABC News' George Stephanopoulos that she hopes the bargaining continues, but acknowledged the two sides are "still pretty far apart" because of "fundamental differences" about the definition of infrastructure, and the total cost of the package, even after President Biden trimmed the proposal down by more than $500 billion last week.

Meanwhile, White House adviser Cedric Richmond told CNN's Dana Bash that the latest adjustment to the price tag shows Biden is willing to "negotiate in good faith" and in a "serious manner" and suggested the onus now falls on Republicans like Collins to reciprocate.