President Joe Biden on Wednesday unveiled a massive proposal aimed at overhauling the countrys aging roads and bridges, boosting manufacturing, mitigating climate change and making key investments in elder care and housing.

The $2 trillion American Jobs Plan, which Biden announced in a speech at a union hall in Pittsburgh, is part of the presidents Build Back Better agenda he ran on during the 2020 campaign. Next month, the president will detail another portion of the plan focused on child care, family tax credits and other domestic programs.

Well all do better when we all do well, Biden said in the speech. Its time to build our economy from the bottom up and the middle out. Wall Street didnt build this country. You, the middle class, built this country. And unions built the middle class.

The first package includes $621 billion for roads, highways, bridges and waterways, as well as additional investments to electrify vehicles, expand internet broadband and make the nations infrastructure more resilient to climate change. It would also spend $400 billion to care for the elderly and people with disabilities, $300 billion toward building and retrofitting homes, and $300 billion on innovation and research.

A senior Biden administration official, briefing reporters on the plan in a Tuesday night call, compared the legislation to historic and galvanizing public investment programs weve had in the past, such as the creation of the interstate highway system or the launch of the space program.

This is an important moment to demonstrate that the United States and democracies can deliver for people, the official said. The stakes of this moment are high, the world is watching.

The administration says the infrastructure spending will help modernize more than 20,000 miles of road, double federal spending on public transportation, lead to the repair of economically significant bridges and help lead to the electrification of the nations transportation system, including building 500,000 electric vehicle charging stations around the country and replacing diesel buses with electric ones.

Still, some nonpartisan groups argue the United States should spend even more on infrastructure: The American Society of Civil Engineers said in its latest infrastructure scorecard that the U.S. needs to invest $2.59 trillion by 2025.

The White House envisions paying for the plan by reversing some of the 2017 tax cut law and raising taxes on corporations from 21% to 28%. They say it would be paid for in full in 15 years longer than the spending portion of the plan, which runs only eight years. The shortened window was likely made in hopes of making it more palatable to members of Congress.

The plan faces an unclear path forward in Congress, though administration officials said they were prepared to negotiate with members of both parties, and the top Democrats, Senate Majority Leader Chuck Schumer and House Speaker Nancy Pelosi, are likely to make its passage a priority. Already the plan is facing criticism from both sides of the aisle.

Rep. Alexandria Ocasio-Cortez (D-N.Y.), a top climate hawk, wrote in a post on Twitter on Tuesday that Bidens plan needs to be way bigger to address long-standing climate and infrastructure needs. The congresswoman leads an influential bloc of progressives who are in a position to make demands from House leadership if they decide to do so. (Last week, the Congressional Progressive Caucus called for $10 trillion in federal infrastructure spending over the next decade a price tag sure to alarm moderate Democrats.)