I don't know what he's worried about. They've done this (similar group drives to call attention to issues) before and been calm and orderly. Most truckers I know are about the most decent people you'll find.
Trying to shut down the voice of the people is only going to fan flames of dissent. At least it should, if people still care about this nation. I've been a bit surprised to find people taking the time to actually bother even voicing unhappiness lately, let alone seeing the President's approval rating slip like it has so it seems people are getting mighty tired of not having their voices heard. Now that it's affecting more people personally and hitting them in the pocketbook.
You know, given that the average truck driver has more brains, common sense, and willingness to stand up for freedom and the rights of citizens than the average person working for us in Washington seems to have right now, I wonder what would happen if we switched out each member of congress with one truck driver that was trying to drive up there. LOL I wonder how fast some common sense and a no-nonsense approach would fix half the garbage going on.