Republicans want to reschedule Presidential Election!

The presidential election of 1812 took place in the midst of the war with the British.

Despite the Civil War, voting for Congress and governorships went ahead in 1862.

The 1864 presidential election also went forward.

Why, then, is the White House and the Office of Homeland Security looking for ways to delay the election (as reported everywhere today)? Is it because they think they are going to lose? How many other ways do they want to violate the constitution (beyond the ways they already have)?