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By Michael Isikoff

Only four Port Authority officials met this week's deadline to turn over all documents subpoenaed in the New Jersey Legislature's investigation into the George Washington Bridge lane closures, according to a list provided to NBC News.

Fourteen others who were subpoenaed-- including workers in Gov. Chris Christie's office, members of his campaign committee, his press secretary and other top aides -- have either been granted extensions or have begun turning over material "on a rolling basis," according to a source close to the investigation.

Two of those subpoenaed -- former Deputy Chief of Staff Bridget Kelly and former campaign manager Bill Stepien -- have invoked their Fifth Amendment right against self incrimination and declined to turn over any material.

The list of those who have yet to fully comply with the subpoenas includes David Sampson, Christies' close political ally who chairs the Port Authority; Charles McKenna, Christie's former chief counsel; Kevin O'Dowd, Christie's former chief of staff and nominee to be attorney general; Reginia Egea, Christie's incoming chief of staff; and Nicole Davidman Drewniak, a Christie fundraiser and wife of Christie press secretary Michael Drewniak.

All told, the special legislative committee investigating whether the bridge lane closures in September 2013 were politically motivated has issued 20 subpoenas to members of the Christie administration, his campaign and officials of the Port Authority, which oversees the bridge.

The subpoenas from the legislative committee are separate from those issued by the U.S. Attorney’s Office in Newark, N.J., which also is investigating the bridge lane closures. Christie confirmed Monday night that his office had been served with a subpoena from the U.S. Attorney’s Office, along with his campaign committee and the New Jersey Republican Party.

-- Michael Isikoff