The Federal Election Commission (FEC) has asked a Ted Cruz super PAC to explain why it gave $500,000 to another super PAC supporting one of his Republican rivals.
According to financial disclosures from June, Keep the Promise I - one of four separate committees backing Cruz - gave half a million dollars to CARLY for America, the political action committee supporting Carly Fiorina.
Super PACs are legally allowed to give money to other super PACs - they are only prohibited from donating directly to any political campaign. But it's unusual for one of these groups to give money to an opponent, especially when the candidate it supports is still in the race.
"Keep the Promise I made the donation in June to Ms. Fiorina at that time because we thought she had important things to say that weren't being heard, including her poignant and effective criticism of Mrs. Clinton, at the time, the likely Democratic nominee," Kellyanne Conway, president of Keep the Promise I told CBS News in an email.