Trump has been the subject of dozens of FEC complaints, but with the support of the three Republicans he has compiled a perfect 43-0 record against them. Trump is clearly breaking the law and the US needs an agency willing to enforce laws for the sake of democracy.
Democrats are simply trying to distract from their own failures by going after Trump yet again. Instead of focusing on providing much-needed support to American families, they're busy filing frivolous complaints.
Even if the FEC uncharacteristically takes up this case, Trump will likely claim that he's "testing the waters," which wouldn't require him to file as a candidate. There are no fundraising limits on the kind of soft money that his PAC is curently raising. Once again, Trump is untouchable.