A Chinese company with offices in Markham is believed to be a national security threat in the United States.

Premier Dalton McGuinty says he doesn't understand the concerns the U.S. has about Huawei Technologies, underlining he will listen to any concerns Ottawa may have. As of yet, McGuinty says the federal government has not contacted him but expects it would if there were serious concerns.

The province has invested $6.5 million in the company. The Premier also met with executives during his last trade mission to China, where Huawei announced a $67 million investment to expand its research and development centre in Ottawa.

The U.S. threat-status was revealed in a report by 60 Minutes over the weekend. U.S. Congressman Mike Rogers urged companies Huawei if they value their consumers' privacy and if they care about national security.

Former national security advisor in the U.S. State Department Jim Lewis explains companies in China do whatever the country tells them to do, underlining communications is a strategic industry which is vulnerable to exploitation.

Ontario Progressive Conservative Economic Development Critic Monte McNaughton says he will be writing to the Economic Development Minister to urge him to investigate the grant funding into Huawei.