Aside from my extreme dislike of Ilhan Omar for residing in this country illegally (having married her brother in order to take advantage of that immigration loophole)
She did not marry her brother. Put up some evidence, or shut the fuck up.
Kinda hard to be anti-Semitic when you are Semitic.
Antisemitic is commonly understood to mean "Anti-Jewish", and has done since the 19th century. As the wiki says:
"The root word Semite gives the false impression that antisemitism is directed against all Semitic people, e.g., including Arabs and Assyrians. The compound word antisemite was popularized in Germany in 1879[7] as a scientific-sounding term for Judenhass ("Jew-hatred"),[8][9][10][11][12] and this has been its common use since then."
So, of course she can be antisemitic. Not that I think she is.