[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/07/01/art.mccainclark.ap.jpg caption="McCain traveled to Colombia Tuesday."](CNN) - Sen. John McCain appeared to raise the stakes in the ongoing back-and-forth over Wesley Clark's controversial comments, saying Tuesday evening that Barack Obama should "cut him loose."
Speaking to reporters on his press plane en route to Colombia, McCain suggested it’s time for the Illinois senator to completely sever ties with the former general and onetime presidential candidate
"I think it's up to Senator Obama now to not only repudiate him but cut him loose."
Clark, a former supporter of Hillary Clinton, does not hold an official role within the Obama campaign.
Clark caused an uproar Sunday after questioning whether McCain's military experience qualified him to be commander-in-chief. Obama has said he disagrees with Clark's comments, calling them "inartful."
But McCain wouldn't say if he thought Obama had sufficiently repudiated the remark.
“That's up to others to decide," he said. "I'm not going to worry about comments that General Clark made. I have plenty of people who will respond to that kind of thing.”