Palin's son-in-law slams Trump for Khan insults: He needs to act presidential -- and apologize

Medal of Honor recipient Dakota Meyer -- who's also Sarah Palin's son-in-law -- harshly rebuked Donald Trump for his insults against a Muslim family who lost their son fighting in the Iraq War.

Meyer, who also criticized anti-war protesters who interrupted last week's Democratic National Convention, slammed the Republican presidential nominee for his continuing attacks against the parents of Capt. Humayun Khan, who died in June 2004 while trying to protect his comrades from a suicide bomber.

His parents, Khizr Khan and Ghazala Khan, challenged Trump's patriotism in a speech Thursday at the DNC, pulling out a copy of the U.S. Constitution and saying: “You have sacrificed nothing and no one.”

Trump and his surrogates have spent days attacking the Khans, who immigrated from Pakistan, and suggesting the couple and their son may have ties to terrorist groups.

Meyer, who married Trump supporter Palin's eldest daughter in June, said the Republican presidential nominee had crossed the line.

"If @realDonaldTrump wants to be the Commander in Chief, he needs to act like one. And that cant start until he apologizes to the Khans," Meyer posted Tuesday on his verified Twitter account.

Meyer, who was awarded the Medal of Honor in 2011 for his service in Afghanistan, married Bristol Palin earlier this summer after a contentious custody battle over their daughter, Sailor Grace, who was born in December.

The decorated veteran slammed protesters who interrupted military speakers at the DNC with chants of "no more war," but he also criticized Trump over the weekend on Fox News for suggesting the U.S. military was weak.

“I think that’s why you see some of those military supporters going to that side," Meyer said Saturday. "I mean, we’re not weak. He’s absolutely wrong. That’s the thing. If Donald Trump loses — he’s out focused on Ted Cruz, he’s still being an entertainer — at what point is he gonna turn around and start being a leader?"

"If Donald Trump loses this election, it’s because Donald Trump lost it himself," Meyer added.