Donald Trump’s spokeswoman said Tuesday that the father of Army Capt. Humayun Khan, who spoke critically of the GOP presidential nominee at the Democratic National Convention, is a proponent of Sharia, or Islamic law.

{mosads}”This father apparently has been a strong proponent of Sharia law,” Katrina Pierson said Tuesday on “The Kelly File,” when asked why Trump questioned why Ghazala Khan, the mother of Humayun, didn’t speak during the Democratic convention.

Khizr Khan, Humayun’s father, criticized Trump last week in a speech at the Democratic convention during which his wife stood by his side.

In response, Trump criticized Khan and questioned why his wife, who was standing next to him at the convention, did not speak, suggesting it may have something to do with her religion.

Pierson defended Trump’s comments Tuesday, saying reports had surfaced about Khan “writing law briefs for Sharia law.”

“How is that a far-fetched assumption?” Pierson said on CNN earlier Tuesday.

Trump’s response to the Khan family has fueled criticism from both Republicans and Democrats.

President Obama on Tuesday called the GOP nominee “unfit” to be president.