Trump says he's never heard of the term 'second lady'

While hosting a picnic for military families on the South Lawn of the White House, Donald Trump addressed the crowd to pledge his "unwavering support for military families."

He recognized Vice President Mike Pence's son, who is in the Marines, but it was his comment about Pence's wife that raised eyebrows.

While reading his prepared remarks, Trump stopped to note that he has never heard the term "second lady" before.

Here's his statement, according to New York Magazine:

There is one military family here I am especially excited to recognize. Our great Vice-President Mike Pence and our second lady — never heard that term before but that's what they say, and she is some lady, that I can tell you — of the United States, Karen Pence, are here along with their son Maine First Lieutenant Michael Pence.

The term "first lady" was coined 1849. A few decades later, Jennie Tuttle Hobart, the wife of President William McKinley's vice-president, Garret Hobart, called herself the "second lady," making the title official.

Though former Vice President Joe Biden's wife was more often called Dr. Jill Biden than the second lady, it's certainly not a rare term -- the White House website calls Karen Pence "Second Lady of the United States," and she used the moniker as her Twitter handle.

See photos of the vice president and second lady:

17 PHOTOS
Mike and Karen Pence
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Mike and Karen Pence

U.S. Vice President Mike Pence, left, and his wife, Karen Pence acknowledge the audience before he speaks at the Republican Jewish Coalition's annual meeting in Las Vegas, Nevada February 24, 2017.

(REUTERS/David Becker)

U.S. Vice President Mike Pence, his wife Karen and daughter Charlotte, visit the former German Nazi concentration camp in Dachau near Munich, Germany February 19, 2017.

(REUTERS/Michael Dalder)

U.S. Vice President Mike Pence and his wife Karen wave after he spoke at the Conservative Political Action Conference (CPAC) in National Harbor, Maryland, U.S., February 23, 2017.

(REUTERS/Joshua Roberts)

U.S. Vice President Mike Pence and his wife Karen arrive in Munich, Germany, February 17, 2017.

(REUTERS/Michaela Rehle)

U.S. President Donald Trump with his wife Melania and Vice President Mike Pence with his wife Karen dance at a Liberty Ball in Washington, U.S., January 20, 2017.

(REUTERS/Yuri Gripas)

Mike Pence kisses his wife Karen after taking the oath of office for U.S. Vice President during inauguration ceremonies swearing in Donald Trump as the 45th president of the United States on the West front of the U.S. Capitol in Washington, U.S., January 20, 2017.

(REUTERS/Lucy Nicholson)

U.S. President Donald Trump with his wife Melania and Vice President Mike Pence with his wife Karen cut a cake at the Armed Services Ball in Washington, U.S., January 20, 2017.

(REUTERS/Yuri Gripas)

U.S. Vice President Mike Pence with his wife Karen waves at a Liberty Ball in Washington, U.S., January 20, 2017.

(REUTERS/Yuri Gripas)

Mike Pence is sworn in as U.S. Vice President as his wife Karen holds a bible during inauguration ceremonies swearing in Donald Trump as the 45th president of the United States on the West front of the U.S. Capitol in Washington, U.S., January 20, 2017.

(REUTERS/Kevin Lamarque)

Vice President Mike Pence is sworn in as his wife Karen Pence watches during inauguration ceremonies swearing in Donald Trump as the 45th president of the United States on the West front of the U.S. Capitol in Washington, U.S., January 20, 2017.

(REUTERS/Carlos Barria)

U.S. Vice President Joe Biden says goodbye to Karen Pence after a luncheon and meeting with Vice President-elect Mike Pence at the Naval Observatory in Washington, U.S., November 16, 2016.

(REUTERS/Gary Cameron)

Indiana Governor Mike Pence, the Republican vice presidential nominee, and his wife Karen arrive to a rally in Charlotte, North Carolina, U.S. October 10, 2016.

(REUTERS/Jason Miczek)

Indiana Governor Mike Pence holds hands with wife Karen Pence after being named Donald Trump's Vice Presidential candidate as the walk out of Trump Tower in New York, U.S., July 15, 2016.

(REUTERS/Carlo Allegri)

Indiana governor Mike Pence and wife Karen Pence attends the 2014 IPL 500 Festival Parade during the 2014 Indy 500 Festival at on May 24, 2014 in Indianapolis, Indiana.

(Photo by Michael Hickey/Getty Images)

Republican Vice presidential nominee Mike Pence and wife Karen listen as Republican presidential nominee Donald Trump addresses the final rally of his 2016 presidential campaign at Devos Place in Grand Rapids, Michigan on November 7, 2016.

(MANDEL NGAN/AFP/Getty Images)

Former U.S. Vice President Dick Cheney introduces U.S. Vice President Mike Pence and his wife Karen Pence at the Republican Jewish Coalition's annual leadership meeting at The Venetian Las Vegas on February 24, 2017 in Las Vegas, Nevada. Mike Pence's speech to the group of Republican Jewish leaders and donors follows his trip last week to Germany where he visited the former Dachau concentration camp and a surprise stop on Wednesday at a Jewish cemetery in Missouri that had been vandalized.

(Photo by Ethan Miller/Getty Images)

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