“The choice is clear: Rep. Omar has spent three terms in Congress dividing our neighbors and party, enriching herself, and voting against the values of our community. I have spent a lifetime committed to our community and focused on improving safety, education, and opportunities for all my neighbors. For Goodness sake, vote on August 13!”

That's not very specific. What exactly has Ilhan Omar done that he doesn't like? This article isn't very informative, but looking around the site, other articles have more info:

“Locally, my opponent was a strident supporter of the defund the police movement, even rebuking President Barack Obama when he referred to it as a ‘snappy slogan’ that would make reform more difficult,” said Samuels. “Nationally, she also voted against President Biden’s signature infrastructure legislation,” he added.

In addition, Samuels points to Rep. Omar’s foreign policy record, citing her vote against aid to Ukraine, her opposition to sanctions against Russia and Turkey, and her statements regarding Israel since the war in Gaza.

EDIT: Not sure what vote about Ukraine aid he's talking about. She voted for aid to Ukraine according to this: https://omar.house.gov/media/press-releases/rep-omar-statement-foreign-aid-supplemental-bills

IIRC there was a bill that combined aid to Ukraine with aid to Israel, which I wouldn't fault her for voting against.