President Trump's Defense Secretary had a message to the forces about North Korea on Columbus Day.

FOX's Lucas Tomlinson is at the Pentagon with the details:

Defense Secretary Jim Mattis told a packed Army conference in Washington D.C., that while diplomacy remains the priority for dealing with North Korea:

(Mattis) "There's one thing the U.S. Army can do, and that is you have got to be ready to ensure that we have military options that our President can employ if needed. We currently are in a diplomatically led effort."

The news comes on the eve of North Korea celebrating the founding of the communist party there in 1945.

In the past, Pyongyang has marked national holidays with missile tests.

Monday, President Trump said in a tweet the United States has been unsuccessfully dealing with North Korea for 25 years, giving billions of dollars & getting nothing in return.

At the Pentagon, Lucas Tomlinson, FOX News.

Follow Lucas Tomlinson on Twitter: @LucasFOXNews