Yes, a relative few, and yes, mostly kids.
As far as "since tRump took office", it's really only the last few months that have seen any sort of increase and who benefits from the public spectacle of that? Not the democrats that's for sure.
Sure they do...……….they create the problem in the effort to give themselves a policy to stand on that is in direct opposition to Trump.
Do I need to explain that????? OK.
Most Americans are in favor of that wall that was a big part of Trump's campaign...….well who needs a wall if there aren't THAT many crossing? So organize them and bring them on by the droves, knowing full well Trump will have them stopped at the border. What happens when you have 10's of thousands of people in detention? One of Dem's battle cries of 'Oh those poor people being treated soooo unfairly and in deplorable conditions and those children being ripped from their parents, yada yada......Trump how could you!!" And don't forget "We are a country of immigrants, we welcome all" ……..but they seem to 'forget' the majority of immigrants this country is made of are all LEGAL...……...then of course we can't forget all those new votes.