From the Guardian:

A Trump campaign spokesperson said the report in the Atlantic was not true.

“The Atlantic story is false and ridiculous. The types of contingency plans included in the story are impossible,” the spokesperson said. “States have laws that determine how electors are selected. Especially if we’re looking at states that could have mail ballot problems (eg Pennsylvania, Michigan), no Democrat governor is going to sign a bill repealing those laws.”

Experts cast doubt on the feasibility of such an effort.

“It’s the ultimate nightmare scenario for the country. There’s no reason to think there would be any appropriate basis for doing this. It’s not at all clear that the legal power to do it even exists,” said Richard Pildes, a law professor at New York University. “There’s a delicate line in talking about and educating people about all sorts of potential scenarios that could emerge and creating unwarranted anxiety about what is likely to be a relatively well-functioning election process.”