WASHINGTON – A bipartisan group of senators said they have reached an agreement in principle with the White House on a $1.25 trillion infrastructure plan, breaking a weeks-long logjam on a sweeping deal to modernize America's deteriorating transportation systems such as rail, bridges and waterways.

Some details, generally described as workable, still need to be ironed out, but comments from several senators and the White House indicate an agreement is at hand.

Joe Manchin, D-W.Va., another of the negotiators, confirmed to reporters that the agreed-upon framework is the same size as the $1.25 trillion package crafted by 21 centrist senators – 11 Republicans and 10 Democrats – who have been trying to reach a compromise since President Joe Biden first unveiled his American Jobs Plan in April.

The relatively large size of the group suggests the deal can survive attempts from far-right and far-left senators to filibuster it.

Included in the package is $579 billion in new money, Manchin said – less than the $1 trillion Biden had initially demanded but far more than initial proposals from GOP senators.

White House press secretary Jen Psaki described the meetings Wednesday with senators as "productive," saying the group “made progress towards an outline of a potential agreement.” She said Biden invited the group to come to the White House Thursday to continue talks.

More: $1.2 trillion bipartisan infrastructure deal gaining steam on Capitol Hill.

The White House has called indexing the gas tax to inflation – as pushed by some Republican senators in the group – a “non-starter,” noting it would break Biden’s pledge to not increase taxes on Americans earning less than $400,000.

“We are not for a Ford F-150 tax,” White House press secretary Jen Psaki said Wednesday

That not only would include elements of Biden's American Jobs Plan left out of the bipartisan deal but also bring in pillars of his $1.8 trillion American Families Plan that includes "human infrastructure" such as free community college tuition, universal preschool and child care