I have been working for company A under TN for 2 years, and accecpted an offer from company B. They filed for new TN (with change of employer checked) and it's approved. The start day is in 2 weeks, but I told my manager last friday and he's willing to offer me a counter offer so I am planning to accept it. So what will happen if I don't join company B, now that the new TN (with change of employer) is approved with start day in 2 weeks. Will my current TN become invalid in 2 weeks?