Interpretive park ranger Caitlin Kostic, center, gives a tour of the Gettysburg National Military Park to Republican presidential candidate Donald Trump, left, and Steve Bannon on Oct. 22, 2016, in Gettysburg, Pa. Bannon is a founder and former executive of Breitbart, is one of Trump’s top advisers and has long campaigned to discredit climate change scientists.
Interpretive park ranger Caitlin Kostic, center, gives a tour of the Gettysburg National Military Park to Republican presidential candidate Donald Trump, left, and Steve Bannon on Oct. 22, 2016, in Gettysburg, Pa. Bannon is a founder and former executive of Breitbart, is one of Trump’s top advisers and has long campaigned to discredit climate change scientists. Evan Vucci AP
Interpretive park ranger Caitlin Kostic, center, gives a tour of the Gettysburg National Military Park to Republican presidential candidate Donald Trump, left, and Steve Bannon on Oct. 22, 2016, in Gettysburg, Pa. Bannon is a founder and former executive of Breitbart, is one of Trump’s top advisers and has long campaigned to discredit climate change scientists. Evan Vucci AP

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