US presidential candidates declared Monday a temporary truce as they vowed to take care of returning war veterans, ahead of a tense week that could see Barack Obama sew up the Democratic nomination. While Obama and presumptive Republican nominee John McCain vehemently disagree over the Iraq war, both used the Memorial Day holiday to promise to do more to help soldiers returning from Iraq and Afghanistan gain medical care and education benefits. "As president, I will do everything in my power to ensure that those who serve today and those who have served in the past have access to the highest quality health, mental health and rehabilitative care in the world," McCain said at an event in Albuquerque, New Mexico.