No, he needs to get the GOP with him. It may change into a new party (as the Whigs did) but right now our system is set up for two parties, and all a third party will do is make sure the GOP never wins and there won’t even be a token presence.
The new third party will never win either but, if it’s lucky, might become a European style minority party that essentially sends its voters to a major party.
Europe has a parliamentary system where there are numerous parties but their elected representatives vote in coalitions. So a smaller party ends up casting its votes with one of the two largest parties. The major parties work to cultivate the favor of the minority parties as long as they need their votes, but in the case of conservative splinter parties, the major theoretically conservative party rarely carry out or support any of their conservative policies.
Shut up you craven GOP sycophant.