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A 12-year-old California boy who went viral for placing American flags and flowers at the graves of veterans said it was an honor to be a guest at President Donald Trump's State of the Union address and sit next to first lady Melania Trump.

Preston Sharp gained national attention last year for starting a campaign to salute deceased veterans across the country with a flag and a flower on their headstones.

The idea came to him when he visited his grandfather's grave at the McDonald cemetery in Redding, Calif., in 2015, and he noticed many veterans' graves had no flag or flower. He decided to take it upon himself to make sure every veteran would be honored.

He has since helped facilitate the placement of more than 40,000 flags and flowers on veterans' graves.

The patriotic campaign resulted in Sharp receiving an invite to Tuesday's State of the Union address, where he sat next to the first lady in the gallery and President Trump paid tribute to his service.

"Young patriots like Preston teach all of us about our civic duty as Americans. Preston's reverence for those who have served our nation reminds us why we salute our flag, why we put our hands on our hearts for the Pledge of Allegiance, and why we proudly stand for the national anthem," the president said.

“It was just a huge honor to be at the State of the Union, sitting next to Melania Trump," Sharp said on "Fox & Friends." "It was amazing."

He noted that the first lady was "really nice," and he also had an opportunity to meet Vice President Mike Pence and Secretary of Veterans Affairs David Shulkin during his "amazing" visit to Washington, D.C.

Watch more above.

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