"Accordingly, we respectfully but firmly urge you to do everything in your power to ensure that President Trump and other administration officials understand the importance of speaking, and acting with the utmost caution and restraint on this delicate issue."

The lawmakers warned that Congress and the American people will hold Trump responsible if a "careless or ill-advised miscalculation results in conflict that endangers our service members and our regional allies."

They also called on Trump to uphold the Constitution and seek congressional authorization before carrying out any pre-emptive attack on the North.

Tillerson's call for talks with North Korea is "strongly" supported by the 62 lawmakers and should be followed by an effort to minimize the preconditions, they said. (Yonhap)