John James Duncan Jr. (born July 21, 1947) is an American politician who served as the U.S. representative for Tennessee's 2nd congressional district from 1988 to 2019.

An attorney, former Criminal Court judge, and former long serving member of the Army National Guard, published author and newspaper columnist.

He was re-elected every two years from then until his retirement from a district that had been held continuously by Republicans (or their antecedents) since 1859, and by a Duncan since his father was first elected in 1964.

His eventual replacement Tim Burchett, who was the Knox County, Tennessee Mayor at the time announced his intention to run for the seat shortly thereafter.

[6] Duncan voted against authorizing the 2003 War in Iraq based on opposition to what he believed to be an unnecessary foreign involvement.

[11] Duncan and Ron Paul were the only members of Congress to vote for the removal of troops from Afghanistan and against all recent bailout and stimulus bills.

[13][non-primary source needed] Duncan was a member of the Liberty Caucus, a group of libertarian-minded congressional Republicans.

[14] Other members included Walter B. Jones of North Carolina, Roscoe Bartlett of Maryland, Scott Garrett of New Jersey, and Jeff Flake of Arizona.

"[16] The American Conservative Union gave Duncan a 96% score for his voting record in 2013, higher than any other federal Representative in Congress from Tennessee.

[21][non-primary source needed] In February 2017, Duncan refused to hold any town halls in his district after the election of then recently inaugurated President Donald Trump.

Duncan said that he preferred one-on-one meetings rather than town halls, adding that he was not willing to give a platform to "extremists, kooks and radicals.

[23] However his son, John Duncan III (R) a Knox County Trustee, pled guilty to a felony charge of official misconduct for handing out bonuses to his own staff for training they had not received.

[26] Following his retirement from the U.S. House of Representatives Duncan published a book about his life and career titled "From Batboy to Congressman."

After retiring from Congress, Duncan relocated from his home in Knoxville to Bean Station in neighboring Grainger County.