To add to that, on 4/12 Trump said USD was too strong (it fell right afterward). Weaker dollar means we get more exports and tourism (in theory) since buying American products/services is cheaper for foreigners. It also means our imports and vacations outside the country get more expensive.
On the other hand I don't know exactly where to put the US economy currently, there seems to be some troublesome data but you have to look for yourself.
Yeah, seems like we're in a real weird place right now (and I don't mean politically). Third-longest expansionary period in the post-WWII era, right?
Don't think anyone's really explained why the dollar's been falling for the past few months, but you can see some finer-grained analysis here: http://www.marketwatch.com/topics/columns/currencies
It's a variety of reasons, but a lot of it is political anxiety. Rose slightly after the jobs report, but dipped before that due to the GDP report. Perhaps just gradually plunging confidence?
Personally I'm a fan of a stronger dollar relative to other currencies, but to each their own.