The traditional surface transportation advocacy groups are gearing up for the start of serious discussions on policy and funding after the President’s budget is presented on Feb. 12. Detailed principles of Trump’s long-awaited infrastructure proposal will be rolled out soon afterwards, says White House aide Paul Teller.

Further delay in presenting details of Trump’s program—said to be an 60+-page set of principles, not legislation—would complicate the job of explaining its fine points to the traditional coalitions that help frame the legislative debate on infrastructure funding.

For proponents of the Trump plan, finding a legislative sponsor, negotiating refinements to the White House “principles,” and then drafting a bill that gradually changes a wide range of federal infrastructure programs is the goal.