"Anti-Semitism is real," Omar tweeted Monday afternoon, "and I am grateful for Jewish allies and colleagues who are educating me on the painful history of anti-Semitic tropes."
She added, "We have to always be willing to step back and think through criticism, just as I expect people to hear me when others attack me for my identity. This is why I unequivocally apologize."
Omar questioned the financial relationship between AIPAC, the powerful pro-Israel lobby, and members of Congress in tweets over the weekend. In her apology, Omar added that she still believes there is a "problematic role" for lobbyists, whether it's AIPAC or the NRA.
The House leaders' statement, led by Speaker Nancy Pelosi, D-Calif., called the tweets "deeply offensive."