Trade should not be a weapon,’ the investor said as he decried policies that create a few winners and widespread resentment elsewhere.

Warren Buffett warned of the perils of excessive tariffs, saying they should not be a "weapon" and that the U.S. would be more prosperous if other countries were.

Although the typical shareholder meeting is a dusty, staid affair, the Berkshire Hathaway annual shareholders meeting is entirely different.