TRENTON - Gov. Chris Christie says that it is inappropriate to criticize the parents of an American soldier killed in Iraq.

Republican presidential nominee Donald Trump has been engaged in an emotionally charged feud with Khizr and Ghazala Khan, whose son, Capt. Humayun Khan, was killed by a suicide bomber.

The governor says that the unfathomable pain of losing their son gives the Khans the right to say whatever they want.

Khizr Khan gave an emotional tribute to his son last week at the Democratic National Convention that was also heavily critical of Trump.

Responding to comments from President Barack Obama that Trump isn't qualified to be president, Christie says that the president has disqualified himself from giving comments like that because he says Hillary Clinton is the most qualified person in American history to be president.

Trump is also taking criticism for comments he made after a military veteran gave Trump his Purple Heart award.

"I always wanted to get the Purple Heart. This was much easier," Trump joked at an event in Ashburn, Virginia.

Many did not like the comments because Trump never served in the United States Military. He received medical and education deferments during the Vietnam War era

The Associated Press wire services contributed to this report.