The interesting thing is, Congress has worked across the aisle in our history. Hell, in MY history (my time on Earth) they have done this. Most recent examples are when O'Neill and the Democrats worked closely with Reagan, and Gingrich and the Republicans worked closely with Clinton. And in both cases, within Congress, both parties worked with each other.
For the last 10 years or so, the divide has gotten bigger, and I think, sadly, part of what you're seeing today came out of the very public proclamations from the Republicans, while Obama was in the WH, that the Republicans wouldn't work with him - or his party. I guess paybacks are a bitch, and as much as I don't care for the Democrats, they are human and are exhibiting human behavior. The Republicans obstructed them, and now they are doing the same thing.
Damn sad, if you ask me. I miss the days of the opposing party working with the President and each other. It worked great during the Reagan and Clinton years. We need to bring it back. But it won't happen with Trump in office, and it won't happen as long as one party controls all 3 branches of government - either party.