"Allow the U.S. president to enter "executive agreements" that empower police in foreign nations that have weaker privacy laws than the United States to seize data in the United States while ignoring U.S. privacy laws."
There are countries out there which have weaker privacy laws than America's current policy of "there is no protection whatsoever, so long as the government is involved or its profitable"?
Because we didn't exactly ever get around to fixing the NSA, or the patriot act, or do anything to discourage massive private and governmental collection of data, or figure out how to prevent massive data breaches of those giant databases, or come up with a way to protect the "everybody" who has had their SSN stolen, or for that matter ever elect a single person to the federal government who actually understands how the internet works and realizes why we need to take privacy seriously.
Handing this kind of data out to foreign governments isn't just going to get innocent Americans arrested overseas (and in America), it completely obliterates the idea of National Security.
If we ever get into (another) war, I would much rather the enemy not have a comprehensive database about every individual American soldier - including name, address, family, previous work/skills, fingerprints, SSN, Drivers license photo, phone records, personal emails, social media accounts, and now even criminal records.