You can look them up. I think you know your statement that it was "alleged by Trump," implying it was only him, or your subsequent statement that it was "anonymous" people are both false.
Since these people who alleged this are not anonymous according to you, how about you post a list of them. I never implied it was only Trump who alleged that she married her brother.
Explain these, Omar was married to Ahmed Elmi from 2009 to 2017. She became a U.S. citizen in 2000, nine years before they were married.
Parents who are here legally can sponsor their children. No need for siblings to get married.
According to Megan Kelly, "If it were proven that her father’s naturalization involved fraud, Ilhan Omar’s citizenship could be challenged. That would have major consequences, as only U.S. citizens can serve in the House of Representatives, and she could even face deportation. Neither her nor her father's citizenship have been legally challenged.
The burden of proof is not on Rep. Omar to re-litigate her citizenship decades later; it would be on the government to prove fraud—which has not happened. This issue would have surfaced and been investigated sometime during her campaign for office or after she was elected in 2019 and investigated by the DHS, USCIS, or the courts at some point during the past 7 years.
Last month Rep. Nancy Mace (rhymes with nut case), made a motion to seek immigration records to determine whether federal laws were violated in connection with the immigration of Omar and her brother/husband. The motion was tabled by both Democrats and Republicans on the Committee.
There is no definitive evidence which supports Ilhan marrying her brother.