The Vice President presides over Congress' certification of the results, but he cannot intervene in the process.
If there is any objection to a state's electoral votes, it must be made by at least one senator and one representative. The objection must also be presented in writing by at least one member of each Senate and the House. If the objection is valid, both the houses will debate it separately and decide whether it can be entertained. If there's a split decision, the objection fails, and votes are counted as initially cast.
Lastly, Pence himself released a statement saying that he doesn’t have the power to overturn an election result. Instead, he says that the job of a vice president is to "conduct proceedings in an orderly manner even where the count resulted in the defeat of their party or their own candidacy."