WASHINGTON — The message the president is selling to his supporters is clear.

“You don’t have any choice. You have to vote for me,” President Trump told a crowd on Monday at a rally in North Carolina, making a point he has revisited often in recent weeks. “Your way of life is under assault by these people.”

Now, would they like a straw with that?

It turns out that Mr. Trump’s message of outright defiance — against Democrats, against the news media and, often, against facts — can exist in tchotchke form. The president’s campaign, which is relying on small-dollar donors to bolster his re-election effort, is also courting supporters willing to pay a little bit more for reminders of that message.

And the campaign has been creative in quickly bringing to market a range of products memorializing the president’s latest run-in — defiance as lifestyle.