Yemen's Iran-backed Houthis have in recent days attacked Riyadh's international airport and the state oil giant Saudi Aramco, amid renewed fighting with the Saudi-backed forces.
Sisi, who has served as Egypt's president since 2014, said his departure from office was "settled and will not be discussed."
Cooper said the financial pressure had become severe enough that Iran-aligned militias were reportedly withholding payments from their own fighters to funnel money back to the IRGC.
Adam Baron, a Yemen expert and fellow with Washington-based policy institute New America, told the WSJ that the recent Houthi military gains were "undeniably" based on external Iranian assistance.
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The coalition said it had also destroyed two cruise missiles over the Red Sea and three drones in Saudi Arabia's Southern and Riyadh regions.
Damascus has not confirmed the reported conversation between Netanyahu and Ahmed al-Sharaa, while Syrian analysts say direct contacts could reduce tensions but remain far from a peace agreement.
Trump expressed confidence that the Abraham Accords could gain renewed momentum with Saudi Arabia.
Analysis by US advocacy group United Against Nuclear Iran (UANI), shows at least eight gas tankers carrying Iranian liquefied petroleum gas have left the Gulf of Oman since mid-July.
Trump did not confirm previous reports that the US would use a GBU-43/B Massive Ordnance Air Blast bomb (MOAB), colloquially known as the "mother of all bombs," to strike Iran.
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