Donald Trump said the U.S. has shocking weaknesses in ballot safety before a big speech.
He claims China influenced the 2020 vote, saying the result was unfair.
He now plans to investigate more holes ahead of the next midterms elections.
Trump also warned TV stations to air his speech without delay or risk losing their permits.
His talk will push voter fraud stories, not healthcare or other big issues.
Trump keeps saying votes were rigged, though courts tossed every claim for no basis.
He repeats the allegation repeatedly in interviews.