Marco Rubio, Mike Huckabee and Donald Trump have all wrongly attacked rival Ted Cruz for flip-flopping on birthright citizenship since his run for Senate in 2011. Cruz has consistently opposed the policy.
Person: Mike Huckabee
Video: Climate Change Claims
Climate Change Review
FactChecking GOP Economic Debate
The Oregon Shooting and Gun-Free Zones
FactChecking the CNN Republican Debate
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Mailbag: Volcanic Versus Human SO2 Emissions
Readers sent us letters regarding the contributions of human-caused and volcanic emissions of sulfur dioxide, or SO2.