Trump's shift on a massive deal is the latest example of his confounding trade policy

President Donald Trump directed officials to look into getting the US back into the Trans-Pacific Partnership, which would represent a significant personal reversal.
The TPP flip is the latest in a series of confusing trade policy posturing by the president.
The uncertainty has real consequences for the US economy and global markets.
President Donald Trump's tendency to announce sudden changes in trade policy has confused investors and made experts question whether the president actually has a l