Sen. John McCain, chairman of the Armed Services Committee, said in the interview with NBC News, Censor.NET reports.
"There are artillery on the border between North and South Korea that can reach Seoul and we can't take them all out before - I mean, this is a very serious. This may be the first test of this presidency," McCain said.
At the same time, he stressed that the situation should be solved with the help of China that has key influence on the regime in Pyongyang.
"But China can shut them down. Whether they are currency manipulators or not, we should expect them to act to prevent what could be a cataclysmic event," the senator said.
According to him, "China is the key" to solving the problem.
"They can stop this if they want to because of their control over the North Korean economy," McCain concluded.