What's with Obama appearing at the same places as President Trump? He showed up in Italy when the president was there and now he shows up at the G20. Doesn't he know that he is no longer president?

Didn't he say:
"“I would point out that we have one president at a time and one administration at a time.”

And of course, the liberal media will complain about secret service having to follow Trump around, but give Obama a pass. Obama still gets secret service protection and it still costs us money for them to follow him around the world.