Republican presidential candidate in the 2008 election, McCain says all Americans greatly saddened by the tragic loss of Pakistani forces in cross-border air raids.
"I fully support the Nato commitment to investigating this tragedy completely and immediately. It's important to note that certain facts in Pakistan continues to significantly complicate the ability of coalition troops in Afghanistan and to succeed in Afghanistan, "he said.
Later in an interview with Fox Business, McCain noted that Pakistan has every reason to be angry at the killing of his troops, but argues that such things happen in war.
At the same time, the Senators emphasized that the United States also is angry with Pakistan on a number of issues.
"I think they should upset every time something like that happens and it is a tragedy and we have expressed our condolences and military commander, and our ambassadors and everyone and we are here to regret extremely.