By Dan Weil Wharton Prof. Siegel is concerned about inflation and worries that the Russia-Ukraine war will prompt the Fed to slow its interest-rate hikes. Federal Reserve Chairman Jerome Powell said Wednesday that he supported a 0.25-percentage-point increase in interest rates by the Fed at its meeting this month. The renowned Wharton finance professor Jeremy Siegel disagrees. He told CNBC that the central bank at its meeting should lift rates by half a percentage point. Siegel is concerned about inflation, with consumer prices soaring 7.5% in the 12 months through January, the biggest increas…