Republican U.S. presidential candidate Donald Trump speaks at the end of a campaign rally in Eugene, Oregon, U.S., May 6, 2016. Donald Trump on Friday pushed back against renewed calls that the presumptive Republican presidential nominee release his income tax returns before the election, and picked a prominent climate change skeptic to help him formulate his energy policy. American presidential candidates have voluntarily released their tax returns for decades. Democratic presidential front-runner Hillary Clinton and her rival, Senator Bernie Sanders of Vermont, have both released their returns. Trump, who has all but locked up the Republican Party’s nomination for the Nov. 8 presidential election, has said the Internal Revenue Service was auditing his returns and he wanted to wait until the review was over before making them public. “It should be, and I hope it’s before the election,” Trump told ABC’s “Good Morning America.” Trump is building out his […]