"He's not a war hero," Trump said. Sarcastically, Trump quipped, "He's a war hero because he was captured." Then, he added, "I like people that weren't captured"

...Republican leaders and other candidates have been careful in how they respond to his immigration remarks, but his condemnation of McCain opened the floodgates, drawing swift and sharp criticism from other Republicans.

Former Texas governor Rick Perry, himself a subject of recent attacks from Trump, said Trump was "unfit" to serve as president and should "immediately withdraw" from the race...Jeb Bush, the former Florida governor, also chimed in with a Twitter post calling or an end to such "slanderous attacks"...

Wisconsin Gov. Scott Walker, campaigning in Western Iowa, denounced Trump's remarks and said McCain is "undoubtedly an American hero." This is a change in tune for Walker, who on Friday refused to speak ill of Trump over his immigration comments...

Sen. Ted Cruz (R-Tex.), who has been perhaps the loudest defender of Trump's remarks about immigrants and met privately with Trump a few days ago in New York, has been silent, so far, about Trump's comments on McCain's war service.

Trump slams McCain for being ‘captured’ in Vietnam; other Republicans quickly condemn him, by Philip Rucker, Washington Post, July 18 2015