Stocks will struggle and a recession is on the table if the Fed fails to cut rates by September, Wharton professor Jeremy Siegel says

Steve Marcus/Reuters

• The rally in stocks could be endangered if the Fed doesn't cut rates soon, Jeremy Siegel warned.
• The Wharton professor made the case for the central bank to cut rates in September as data softens.
• The US faces a higher risk of recession without cuts, he said, with GDP and job growth slowing.

The rally in...