Former House Speaker Newt Gingrich is warning that Democrats’ “very dangerous” rhetoric and behavior could lead to something “serious” against President Donald Trump.

During an interview on Fox News, Gingrich dismissed a claim by House Minority Leader Hakeem Jeffries, D-N.Y., that Republicans are “on the run,” warning that Democrats are in a rage and offering “no solutions.”

Gingrich said the left is resorting to extreme tactics to resist President Trump and oppose Elon Musk’s efforts to cut government spending.

“Well, I think that everything you showed earlier reflects what Lincoln said at Gettysburg when he said, this is a test of whether this system or any system so conceived in liberty can survive. You have a hard-line group who believe that they have the right to be violent, that they have the right to deny the American people the choice of their leadership, that they have the right to break the law. The answer to all of that is, frankly, you have to lock them up. You have to enforce the law,” Gingrich began.