I can well understand how real conservatives would have a problem with the executive branch performing warrantless searches. It's against the spirit of the constitution, and it puts us in danger if and when Hillary is in the White House.
I hope that you "well understand" that if these terrorists are not caught that you and we will suffer even more 9/11s. Waiting for the courts to issue a warrant will close the window for getting the information from their phone calls. The President took an oath to protect this country. He is doing just that. Instead of quibbling, you should be thanking him for living up to his oath.
The key word in the Constitution is "Unreasonable Searches".
Such protections were never intended for enemy combatants or their agents operating in the US.