Neither the President or the congress has any capability to oversee the elections, nor does any other federal agency have the authority to investigate voter fraud.  The FEC governs the financial transactions of the federal elections, but that is the extent of their power.  It is up to each state to regulate their elections.... and that is why we find ourselves in such an effed up mess now. But I will agree that congress should have passed some federal laws concerning federal elections (preferably voter ID and a method of ensuring voters are legitimate).  Of course it would have been contested highly and probably end up in the Supreme Court, where it would have failed before now.  But now, after all this corruption is glaringly obvious, and with a conservative majority on the bench,, any laws they passed about voter ID would likely easily get through the courts.  https://www.fec.gov/introduction-campaign-finance/election-and-voting-information/ However,