President Donald Trump's political groups have spent more than one-quarter of a billion dollars to bolster Republicans in the final stretch of this year's midterm elections, an unprecedented amount for a sitting president that underscores the stakes on Nov. 3.

In total, Trump's flagship super PAC, MAGA Inc., has reported spending nearly $277 million since the beginning of September, according to new federal campaign finance filings.

That includes major transfers to two affiliated groups that have been spending millions on advertising: $200 million to No Going Back PAC Inc. and $25 million to Safety & Affordability PAC Inc. "It's more than any president has ever spent, by far, on the midterms," said Corry Bliss, a GOP Senate and House campaign strategist who was the executive director of the Congressional Leadership Fund, House Republicans' super PAC in the 2018 campaign.