I don't have a specific cite but I saw it in quotes from when he was announcing 25% tariffs on Canada and Mexico.

He said they could cause price increases and pain in the US but that they would cause more pain in Canada and Mexico.

Trump said it directly in a news conference. https://apnews.com/article/trump-tariffs-canada-mexico-china...

"We may have short-term, a little pain, and people understand that,"

The recording I saw was Trump saying we need to accept pain. He's asked frequently why his actions make very little sense and he typically responds incoherently.

Its in one of his screeds on Truth or Musk Social

Colbert has a good bit and quip about it