Donald Trump’s feud with the father of a slain Muslim soldier who called him out during the Democratic convention is drawing renewed attention to veterans issues, and revealing the wide split between Trump and Hillary Clinton on how best to help veterans who return from the battlefield.

President Obama opened the door to the issue again on Monday, during a speech before a disabled veterans group in Atlanta. He didn’t mention Khizr Khan, who lost his son in 2004 in Iraq and has lambasted Trump for the last several days, but Obama clearly referred to Trump’s feud with Khan by saying the families who have lost loved ones are beyond reproach.