Buffett tackles Trump in defending value of immigrants

Billionaire investor Warren Buffett used his annual letter Saturday to laud immigrants and their contribution to the growth of the US economy amid President Donald Trump's anti-immigrant stance."Americans have combined human ingenuity, a market system, a tide of talented and ambitious immigrants, and the rule of law to deliver abundance beyond any dreams of our forefathers," he wrote in the letter to shareholders of his massive Berkshire Hathaway conglomerate.Buffett steered clear of any mention