"Clearly they thought it was very serious to get these materials back into secured space."
"Republicans have far better options to lead the party in 2024. No one should think otherwise."
"It was almost too stupid for words."
Trump-backed candidates in Ohio, Pennsylvania and North Carolina face active and well-funded challengers seeking the Republican nomination to run for US Senate.
The broadcaster hasn't announced if he will comply.
Trump also released a statement saying Rudy Giuliani is "the greatest Mayor in the history of New York City".
Trump was the first president in 40 years to not release his tax returns.
Ivanka could be in the sights of prosecutors.
It allegedly came amid talk of felony fraud charges against Trump's two eldest children.
