Unlike the other intended recipients of pipe bombs that surfaced this week, the actor Robert De Niro is not a political figure. But like the others — including former Vice President Joseph R. Biden Jr., who also joined the list of targets on Thursday — Mr. De Niro has long been an outspoken critic of President Trump.

Mr. De Niro was also once attacked by Mr. Trump on Twitter, like several of the people who received explosive devices.

Here’s a reminder of the Hollywood star’s public war of words with the president.

[Read more about the wave of explosive devices here.]

De Niro doesn’t mince words

Mr. De Niro’s most public denunciation of Mr. Trump came at the Tony Awards in June.

The actor, who was brought on stage to introduce a performance by Bruce Springsteen, strode up to a microphone. “I’m going to say one thing,” he said.