The President has no constitutional authority to limit travel of its citizens within the United States.Article IV Section 1:
The Citizens of each State shall be entitled to all Privileges and Immunities of Citizens in the several States.States cannot be isolated from each other.
The citizens of one state cannot have their rights curtailed.
p.s. Remember in 2009 when Obama told people not to go to Las Vegas, and people started canceling their conventions?
-PJ
Stealing elections is not constitutional either. He might try because they hate the constitution and crave the power it prohibits from them.