He literally did that yesterday with regards to spending.
If you're asking if he'll misuse the spending powers, for example for Wall funds by claiming the Wall will stop the coronavirus, I'd say fairly unlikely. He was already forced to give an address at political gunpoint.
If you're asking if he'll take other methods, such as blocking state-to-state travel, he already said he's considering it.
If you're asking if he'll cancel or postpone the election, I still think a member of the Secret Service would just shoot him when he tries to appoint himself dictator.