"President Donald J Trump spoke yesterday with President Abdel Fattah Al Sisi of Egypt to convey his deepest condolences to Egypt and to the families who lost loved ones in the heinous terrorist attacks against Christian churches on Palm Sunday," the White House said in a statement.
Trump condemned the attacks that killed 45 people and wounded nearly 120 others.
"The President also expressed his confidence in President Al Sisi's commitment to protect Christians and all Egyptians," the White House said.
"The leaders agreed that Bashar al-Assad's use of chemical weapons against civilians, including women and children, was abhorrent and warranted a strong response from the international community," the White House said.
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During the call, Trump thanked Abe for his support for the United States missile strikes in Syria.
The two leaders pledged to show continued resolve in response to al-Assad's "brutal actions".
Trump and Abe also agreed to further cooperation on a range of regional issues, including the threat posed by North Korea, the White House said.
"The President commended the two commanders and their crews for the speed, precision, and effectiveness with which they carried out the operation.The President communicated that, as the Commander in Chief, he could not be more proud of the crews of USS Porter and USS Ross and their flawless execution of the operation," it added.