Pence refuses to say if climate crisis is a threat to the U.S.

Despite Jake Tapper's best efforts, Vice President Mike Pence would not answer his question on Sunday's State of the Union about whether the "human-induced climate emergency" is a threat to the United States. The CNN host posed the query in response to the Trump administration's decision last week to roll back former President Barack Obama's Clean Power Plan, which worked to reduce pollution from coal plants. After Tapper asked the first time, Pence said the administration will "always follow th...