Yes, so how is that supporting illegal immigration. Also this is for the dreamers, you know children that are undocumented living in the US already. I guess if you totally just dismiss the other parts of their platform on immigration then you can try to make a case but you would still be wrong.
Their platform does not only refer to dreamers but every illegal immigrant in the US that follows the laws. Given citezenship to those that come here illegally is supporting illegal immigration.