Kim Yong-chol, top envoy of the Democratic People's Republic of Korea (DPRK), is expected to arrive in Washington by the weekend and set to stay in the US for two days, CNN reported Thursday.

Kim is vice chairman of DPRK's ruling Workers' Party of Korea (WPK) Central Committee.

According to CNN, Kim is expected to meet US Secretary of State Mike Pompeo and US special representative to the DPRK Steve Biegun on Friday. The group is expected to discuss the details of a planned summit between DPRK leader Kim Jong-un and his US counterpart Donald Trump.

"A lot of positive things are happening," a White House spokesperson told CNN, without confirming anything.

"We are working to make progress on our goal of achieving the final, fully verified denuclearization of North Korea (DPRK), and the president looks forward to meeting Chairman Kim again at their second summit at a place and time yet to be determined."

Republic of Korea's (ROK) official Yonhap News Agency also cited CNN's report. 

China's Foreign Ministry said on Wednesday that Kim Yong-chol will make a stopover in Beijing.

"As far as I know, (he) will be stopping over in Beijing," Hua Chunying said at a regular press briefing.

Kim Yong-chol last visited the US in June, during which he personally delivered a letter from Kim Jong-un to Trump. The two met for two hours in the White House. Ten days after Kim Yong Chol's Washington visit, Kim Jong-un met Trump for the first time in Singapore.

Meanwhile, the ROK and the United States held a working-group meeting via video conference to discuss issues about the Korean Peninsula on Thursday, local media reported citing the ROK Foreign Ministry.

An unnamed official from the ministry was quoted as saying that the ROK-US working group discussed pending issues, including the inter-Korean cooperation and relations between Seoul and Pyongyang and between Pyongyang and Washington, through video conference in the morning.