But that doesn't stop presidential candidates from making bold promises about how much they'll accomplish that day. Here's everything Donald Trump has promised to do on his first day in office (or, in a few cases, things his running mate, Indiana Gov. Mike Pence, has promised Trump will do):
- "Repeal every single Obama executive order." (He has also pledged
more specifically to "eliminate every unconstitutional executive
order.")
- "Repeal Obamacare." (On Trump's campaign website, he's less bullish,
promising only to "ask Congress" on day one to repeal Obamacare
immediately.)
- "End the war on coal."
- "Begin swiftly removing criminal illegal immigrants from this country." (More specifically, Trump has promised to do this in his "first hour" in office, "day one, before the wall, before anything.")

- Meet with Homeland Security officials and generals to begin securing the southern border.
- "Notify all countries that refuse to take back dangerous illegal
immigrants who have committed crimes in this country that they will lose
access to our visa programs if they continue to do so."
- Convene his top generals and inform them they have 30 days to come up with a plan to stop ISIS.
- Fix the Department of Veterans Affairs.
- Call the heads of major companies who are moving operations oversea to inform them that they'll face 35 percent tariffs.
- "Contact countries and say…'Folks, we love protecting you, we want
to continue to protect you but you're not living up to the
bargain'…They're not paying what they're supposed to be paying—which is
very little, by the way."
- "Defend the unborn."
- "Withdraw from TPP."
- "Start taking care of our…military."
- Suspend Syrian refugee resettlement.