(CNN) In her new memoir, "Becoming," former first lady Michelle Obama writes a passage explaining how her predecessor, Laura Bush, had extended her help to Obama when she was an incoming first lady, telling her that if Obama needed help, she was "a phone call away."

In turn, Obama writes she did the same for Melania Trump when it was her turn to occupy the role. Trump, however, has yet to take Obama up on the offer.

On Sunday, Obama was asked about the incident by ABC News' Robin Roberts, "Has (Trump) reached out and asked?"

"No," said Obama. "No, she hasn't."

Roberts did not ask if Obama had reached out to Bush during her tenure for counsel.

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