Republican front-runner Donald Trump and Sen. Marco Rubio (R-Fla.) are questioning President Obama's visit to a mosque in a Baltimore suburb on Wednesday, where he preached religious tolerance, recognized the achievements of Muslim Americans and encouraged young Muslim Americans to feel accepted.

Trump, who has long slyly suggested that Obama is not a Christian, said on Fox News on Wednesday night that Obama might have visited the mosque because "maybe he feels comfortable there." Meanwhile, Rubio said at a town hall at a pub in New Hampshire that Obama's decision to give a speech at a mosque is yet another example of him dividing the country.

Trump was asked to share his thoughts on the Obama's mosque visit -- his first as president -- during an interview with Fox News's Greta Van Susteren.

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