On the Senate floor Wednesday, Senate Democratic Leader Charles Schumer (D-NY) scoffed at the President's threat.
"This is typical bluster from President Trump," Schumer said, predicting the President would not veto the defense bill because of all of the needed Pentagon provisions.
The President's veto threat comes as the Navy and Marine Corps have already said they would remove displays of the Confederate flag from any of their bases.
"Trump is on the wrong & racist side of history," tweeted Rep. Ted Lieu (D-CA).
"Bill after bill with billions - even trillions - in spending, he won’t veto," said Rep. Justin Amash (I-MI). "But removing the names of treasonous Confederate generals, he won’t stand for that."
While President Trump has repeatedly made public statements against the idea of taking down Confederate statues, that keeps happening here and there across the South.
The latest monument came down Tuesday night in Rockdale County, Georgia, just outside of Atlanta.
That monument was put up in 1913.