(Bloomberg) -- Sign up here to receive the Davos Diary, a special daily newsletter that will run from Jan. 20-24.Blackstone Group Inc. chief executive officer Steve Schwarzman said Donald Trump was seeking to defend his economic record in Davos as the U.S. president faces the start of his impeachment trial.“Here’s somebody who is having the impeachment process start with a trial today,” Schwarzman said in an interview with Bloomberg Television on Tuesday at the Swiss resort. “This was a speech to basically say ‘I think we need some perspective and let’s look at what’s happened under this administration.