The Congress shall have Power ... To make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers, and all other Powers vested by this Constitution in the Government of the United States, or in any Department or Officer thereof.
Yes, the power given explicitly to Congress to do what it takes to carry out the other powers.
If you need to know where the power to regulate immigration comes from, you can start there.
Check the phrase "foregoing powers", killroy. Necessary and proper does not convey any special new power. Certainly not unlimited power.
National defense is a 'foregoing power'. Let me walk you through it. You wouldn't answer my question about Syrian refugees,
probably because you realized you were stuck for a good answer.
You believe we can't even screen Syrian refugees, can't refuse any of them entry, because you say the federal government doesn't have that power constitutionally.
Well...
1. National defense is clearly a power the federal government holds
2. The argument for strict screening of Syrian refugees is national defense based.
3. The power to screen the Syrian immigrants is therefore a legitimate implied power, sanctioned by the Necessary and Proper Clause, to execute the explicit power of Congress to defend the country.