Warner made his comments Monday during a campaign event in Norfolk, where he said the bank helps ensure cargo moves through the state's port terminals.
The Ex-Im Bank provides loans, loan guarantees and credit insurance to overseas buyers of U.S. goods. Its charter expires in September, and without legislation it would be unable to back new loans.
Warner's Republican rival, Ed Gillespie, opposes reauthorizing the bank.
With longshoremen standing behind him, Warner said the bank helps support 10,000 port-related jobs.
He also noted that nearly 100 Virginia-based companies throughout the state have had their export activity financed by the bank.
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