Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) President Donald Trump, though often acting as a champion of the military, has at times politicized the sacrifice of those who paid a terrible price in the nation's wars in a way that few of his predecessors would have countenanced. He clearly reveres America's fighting men and women. He often boasts about their prowess, has surrounded himself with hard charging generals and has vowed to reinvent veterans' health care. But he's also been happy to use the military for his own political ends when it suits him. The latest episode -- in which Trump falsely claimed Barack Obama didn't call the families of dead soldiers -- is revealing because it shows how Trump lashes out whenever he believes his conduct or character is under attack. It's another case of him citing information that is either incorrect of unverified when he is on the defensive, a trait that often leads him into deeper political trouble.Controversy over Obama calls not the first time Trump has politicized sacrificePresident facing questions over ISIS ambush that killed four soldiers in Niger 
 Question:Such comments, and his continued propensity for drawing the military into his political spats are only fueling complaints by _'s rivals that he has not fully understood the grave responsibilities of serving as commander in chief.

Donald Trump