According to Gateway Pundit, the attacker appears to be a Somali Muslim from Minnesota named Seyfudin Mohamud. Gateway has that, plus more photos and video, here.
Whether you love Trump or hate him, this is a destructive new feature of American politics. Trump enjoys huge popular support (whether or not it is enough to win him the Presidency), and in response the Left has grown even more thuggish and authoritarian than it already was. Their attack against Trump and those who support him has two prongs: the media claim that his appeal reveals a broad strain of “racism” and “bigotry” among ordinary Americans, and the physical menacing of those who, despite this opprobrium heaped upon their heads, continue to support him.
Those who hate Trump, whatever their own perspectives may be, and who love a free society should be disturbed by this violence. If it continues, those who dissent from the Leftist mainstream line will not only be demonized and marginalized as spreading “hate” — that has been going on for years — but will be aware that by their dissent they are putting themselves in very real physical danger. We’re sliding toward a Leftist autocracy in which “right-wing” dissenters are defamed and brutalized. This is the biggest story of this Presidential campaign year, but the mainstream media is not only not reporting on it, it is aiding and abetting it.