According to Bloomberg, potential Fed changes are causing more investors to pull out of the U.S. market, with the foreign selling of U.S. long-term portfolio assets rising for the second straight month in June. Long-term portfolio assets usually include mortgages.

Bloomberg has more on what's irking investors:

The net long-term portfolio investment outflow was $66.9 billion after a $27 billion net decline in May, the Treasury Department said in a statement today in Washington. Net selling of long-term Treasuries by private foreign investors increased to $40.1 billion from $29 billion the prior month, the department said.