A lawyer for Gov. Chris Christie's two-time campaign manager says the former aide should not be compelled to turn over documents as part of a political payback investigation.

Kevin Marino says in a legal brief that his client, Bill Stepien, has a constitutional right not to incriminate himself and cannot be forced to produce documents that might furnish a link in an evidence chain.

A legislative committee investigating the politically motivated blocking of traffic near the George Washington Bridge is seeking the documents.

Also Monday, a public interest group filed an ethics complaint against David Samson, a powerful real estate lawyer who chairs the agency that runs the bridge. Private emails claimed Samson to be helping retaliate against another executive who ordered the traffic lanes reopened.