National security and terrorism have been a top issue for Republicans, but they have gained even more importance after the Paris and San Bernardino, Calif., attacks.
Marco Rubio and Donald Trump held rallies in Nevada before Tuesday's debate just one mile apart from each other. But Rubio's was traditional and low key; Trump's was the opposite.
In 2011, Obama joked that Trump, who was hot on the trail of Obama's birth certificate, was a conspiracy theorist waiting to reveal the fake moon landing, and recently that Trump was "Here. Still."
Trump supporters express deep devotion for their candidate, more than any other Republican running for president — and that could mean big problems for the party next year.
The current leader for the GOP presidential nomination received a standing ovation from a crowd in South Carolina after he read aloud his statement to ban all Muslims from entering the U.S.
Former Vice President Dick Cheney returned to the U.S. Capitol on Thursday for a ceremony honoring his service as president of the Senate. Former President George W. Bush was among those honoring him.