Understanding what happens in a 269-269 tie

A tie is extremely unlikely and it would take exactly 269-269 to do it. It's unlikely but there are viable paths to it happening (Trumps wins NC, Pennsylvania, and Maine2, but loses Arizona and the other battleground states, gives him exactly 269).

Assuming no faithless electors and the electoral college vote doesn't produce a majority winner, the House of Representatives pick the President.

But it's not as simple as a straight up individual vote. Each state's representatives ultimately cast 1 vote for their state. So the reps of each state get together and vote, and the winner gets that state's vote.

Republicans currently have more house members in 26 states, Democrats in 22, with 2 states having equal members.

That could change a little after the election, but it should be advantage Trump in a tie.

Of course it'd probably never make it that far as Civil War 2, electric boogaloo would well be raging by January.