Earlier, the statement read out by White House press secretary Karoline Leavitt made a similar claim but did not include the line that the warning came “too late to stop the attack”.
Following Leavitt’s press briefing, Qatar said that reports that it was given advanced warning from the US of the Israeli attack on Doha are false and that US officials first warned Qatar of the attack 10 minutes after it had begun.
It’s therefore unclear what Trump means, as my colleague Robert Mackey notes, in that he seems to suggest that he both has the power to stop Israeli strikes, but for some reason did not have the power to stop the one that took place today.