Trump has indicated he would first look at the results and if it looks like no foul play was involved he will accept it. However, if not... he implied he wouldn’t go down LOL. I don’t blame him one bit. You can’t shortcircuit democracy by stealing votes and expect nothing to happen. If war is the alternative, then maybe there should be a war. There’s been plenty of those in the past, but we all know where rigged elections lead to.
FWIW, trump has said on numerous occasions that if he legitimately loses to Biden, he will just go play golf and we’ll never hear about him again.