By Damian J. TroiseAP Business WriterCorporate profits fell for a second straight quarter in the spring as the effect of last year's tax cut wore off and companies contended with uncertainty from the Trump administration's trade wars.As the second-quarter earnings season winds down, companies in the S&P 500 index are on track to notch the first back-to-back quarters of slumping profits in three years.Read more on NewsOK.com