U.S. President Donald Trump speaks to reporters in Washington D.C., March 8, leaving for Alabama to survey areas devastated by powerful tornadoes,. Xinhua-Yonhap

U.S. President Donald Trump said Friday he would be "very disappointed" if North Korea resumed the testing of nuclear weapons and ballistic missiles, but insisted his relationship with North Korean leader Kim Jong-un remains good.

Speaking to reporters at the White House, Trump appeared to address a question about recent reports of rebuilding observed at a key North Korean missile test site.

"Well, time will tell, but I have a feeling that our relationship with North Korea, Kim Jong-un and myself, Chairman Kim, I think it's a very good one. I think it remains good," he said.

"I would be surprised in a negative way if he did anything that was not per our understanding, but we'll see what happens."