They are scared he will make them look foolish.
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He is already doing that and succeeding. He is also exposing them for their hypocrisy, weakness and corruption.
It irks me that some candidates think they have more of a right to run than someone else does. Who do they think they are that they are more special? It shows a very bad tendency when they feel they should push someone else out of the race just because they don’t like him. It is the equivalent of cheating.
People use all kinds of tactics to get more than their one vote. They use pressure, tantrums, drama, ridicule, etc. By “they” I mean everyone from Big Media to special interest groups to party loyalists to candidate supporters to even Internet posters who jump all over someone else just because they support a candidate they disapprove of. It’s shameful.