NEW YORK (AP) — Amtrak CEO Stephen Gardner abruptly resigned from his top post at the U.S. passenger railroad this week.

By David Shepardson WASHINGTON (Reuters) -Amtrak CEO Stephen Gardner said Wednesday he will step down immediately after more than four years as head of the U.S. passenger railroad, citing concerns about maintaining the carrier's support from President Donald Trump's administration.

Amtrak CEO Stephen Gardner in a statement Wednesday announced he will step down from the nation’s passenger rail company as the Trump administration targets funding for mass transit systems and other transportation initiatives across the nation.