Thirty-seven electors would need to defect from Trump’s camp to deprive him of the Electoral College majority he needs to become president. But only one of those 306 electors pledged to him has publicly said he’s revolting. A survey of electors by the Associated Press and a whip count by the RNC both failed to turn up any others who said they’d do so. If those counts are anywhere close to accurate, this effort won’t even come close to succeeding.
But weirdly enough, this scheme arguably seems to be technically possible, because the US Constitution does appear to give the electors the final say in picking the president. The problem is that, if they ever actually did so, they’d create an immense constitutional crisis.