“limited material support” to terrorists are ok to come in.
Check this out:

The chairman of the House Judiciary Committee expressed deep concern over the Obama administration’s change to immigration law, allowing those who have provided “limited material support” to terrorists the access to the United States.

According to Chairman Bob Goodlatte, the new policy amounts to another loophole in the nation’s immigration system.

“This loophole provides bad actors an opportunity to easily manufacture reasons that ‘forced’ them to provide material support to terrorists,” Goodlatte said in a statement Thursday. “With today’s national security threats, why would we ever willingly loosen our immigration laws to allow those who have helped terrorists game the system?