Tell them this:

Anyone who wants you to believe that Donald Trump or his supporters have "undermined the peaceful transfer of power" expects you to ignore a pretty basic fact:

The peaceful transition of power has always been contingent on the American people having faith in the integrity of their elections, and that faith results directly from their confidence that the rules in place to secure our elections, and to demonstrate that security to the people, were followed.

That has not happened here. And it wasn't Trump or his supporters that decided to gut that process.

If you want to know who has undermined the peaceful transition of power, ask who has destroyed the election policies and institutions that have always allowed it to happen.