That’s especially true because there is a large fortune that could be made in a single 140-character message. If someone were able to gain access to Trump’s Twitter, they could tweet approvingly or disapprovingly about a company (as Trump has done) and play the stock market accordingly — or cause others to do so. A market-tracking app called Trigger has already set up an alert that responds whenever Trump tweets about publicly traded companies.

If the hacker were geopolitically motivated, they could tweet favorably or unfavorably about a country or a leader (as Trump has done) and alter foreign affairs. Or if the hacker had a grudge, they could call their enemy out in a tweet (as Trump has done) and unleash the rage of Trump’s nearly 19 million followers. Plus, who knows what’s in Trump’s DMs?

And precisely because the president-elect’s tweets are so far afield of current president Barack Obama’s on-message, workshopped ones, someone with improper access to Trump’s account could accomplish their goals while staying in character as Trump. (A hack of the Associated Press Twitter account in 2013 that falsely asserted breaking news about an explosion at the White House caused the Dow to drop 150 points.)