Oh, puh-leeze. Trump has enough to fund his own campaign many times over. You make it sound like Trump is poor.
Trump does not have a billion dollars cash stuffed down his pants. A lot of his wealth exists as real estate and other illiquid assets. Do you think he is going to sell Trump Tower to finance a doomed presidential campaign?
Or he can
try and suck the teat of the GOP donor class and prove to all the people who actually believe he isn't corrupt or buyable that he is in fact just as bad as the politicians they hate.