Why is Trump so scared of a primary challenger?

[Zorro]

“Crooked Hillary,” Donald Trump tweeted in November 2017, “bought the DNC & then stole the Democratic Primary from Crazy Bernie!” The unusually tight relationship during the 2016 primary between the Democratic National Committee and its presidential front-runner, the president suggested, might be worthy of a Justice Department investigation.

If that were true, then the FBI should have a new case on its hands: the unprecedented collusion between the Republican National Committee and Trump himself.

Clinton, in August 2015, signed a secretive and controversial joint fundraising agreement with the DNC that gave her the vast bulk of money raised and eventually placed some of the party machinery under her financial control. Trump, on the other hand, hasn’t just influenced and benefited from the RNC; he’s inhaled it like a cheeseburger.

In December, nearly two years before the 2020 election, the Republican Party and the president’s re-election campaign literally merged into a single unit, called Trump Victory, which RNC Chair Ronna McDaniel clucked would be “the biggest, most efficient and unified campaign operation in American history.” In January, the party passed a resolution giving the president its “undivided support.”

https://www.latimes.com/opinion/op-ed/la-oe-welch-trump-bill-weld-primary-challenger-20190416-story.html

[Iliyah]

1. Because he's afraid of losing and being put out of the WH

and leader of the government. He's afraid that all the evil corrupt things he has and still is doing will finally catch up with him and he will go down a path of no return. That is why he is promoting violence towards the opposition and the Republican party is allowing him to do so.

They don't care about the country nor her people. They do care about money and power any means necessary.

[TruckFump]

2. That and he is not longer a "sitting president"

and can be charged/indicted. The Sothern District of NY -- what they are looking at has to terrify him. His sister resigned from the Feddie bench over tax manipulations rather than face a court investigation. So whatever they have on the tRump Bunch, it must be bad.

[California_Republic]

3. Mueller challenge would be interesting