Story highlights "I wonder if President Obama would have attended the funeral of Justice Scalia if it were held in a Mosque," Trump tweeted

Trump has long been one of the most vocal skeptics about Obama's birthplace and Christian faith

Washington (CNN) Donald Trump on Saturday suggested President Barack Obama would have attended the funeral of Antonin Scalia had the late Supreme Court justice's service been held in a mosque.

"I wonder if President Obama would have attended the funeral of Justice Scalia if it were held in a Mosque? Very sad that he did not go," he tweeted Saturday.

I wonder if President Obama would have attended the funeral of Justice Scalia if it were held in a Mosque? Very sad that he did not go! — Donald J. Trump (@realDonaldTrump) February 20, 2016

Trump has long been one of the most vocal skeptics about Obama's birthplace and Christian faith. When Obama visited a Baltimore mosque earlier this month, Trump suggested he did so because "maybe he feels comfortable there."

The Republican front-runner also accused Obama of apologizing to Muslims -- without offering any proof -- during the mosque visit after listing off terrorist attacks carried out by radical Islamists.

While Obama did not go to Scalia's funeral , he attended Friday's public viewing at the Supreme Court building as the late justice's casket laid in repose.

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