WASHINGTON — Public-private partnership, a financing model that has started to spread across the U.S., may face some challenges as Congress debates limits on the federal role in infrastructure, according to Simon Santiago, leader of Nossaman LLP's east coast infrastructure practice.

Private activity bonds, the Transportation Infrastructure and Innovation Act (TIFIA) and the Transportation Infrastructure Generating Economic Recovery (TIGER) are among the ``hottest topics" in Washington, Santiago, who helped negotiate the $2.1 billion Elizabeth River Crossings tunnel project in Portsmouth, Va., said in an interview.

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