One of the descendants of Confederate General Robert E. Lee is blasting Rep. Marjorie Taylor Greene for suggesting red and blue states separate … telling us her idea is “nothing short of treason.”

Reverend Robert W. Lee IV, a collateral descendant of General Lee, tells TMZ … by calling for a “national divorce,” MTG is acting no better than the Confederates who fought against the Union during the Civil War.

MTG tweeted out the idea Monday, calling for Democratic and Republican voting states to split. While she didn’t use the word secession, that’s exactly what she’s calling for … and she claims everyone she talks to agrees.

While advocating for the creation of 2 separate governments, she also calls for the federal government to shrink.

Robert admits his ancestor, General Lee, would be totally on board with MTG’s suggestion, but adds that’s nothing to celebrate. Instead, he says the Congresswoman from Georgia is outing herself as a traitor, and he’d like to see more politicians condemn her statement.

Remember, Rev. Lee famously denounced racism and white supremacy at the 2017 MTV VMAs … and he’s been outspoken about taking down statues of Gen. Lee.