Senator Amy Klobuchar of Minnesota unveiled a plan Thursday to spend a trillion dollars in federal funds to upgrade the country’s infrastructure, the first policy announcement of her campaign for the Democratic nomination for president.

The proposal would use a combination of federal dollars, tax subsidies and loan guarantees for state and local governments to upgrade not only crumbling roads, highways and bridges, but also schools, airports, water systems, internet access, public transit and energy systems.

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In a statement, Ms. Klobuchar’s campaign said the infrastructure plan would be her top budget priority as president, with the goal of turning it into reality in her first year in office through a combination of legislation and executive actions.

On the campaign trail, Ms. Klobuchar has presented herself to voters as a seasoned pragmatist who could bridge political divides to get policies passed in Washington.