Egypt is suffering a wave of terrorist attacks, mostly centered in Sinai where militants have killed hundreds of police and soldiers since the army-led ouster of Islamist president Mohamed Morsi in 2013.
"Will be calling the President of Egypt in a short while to discuss the tragic terrorist attack, with so much loss of life".
On Friday Morning, a massive explosion in Al-Rawada mosque, located in the town of Beer El Abed, in North Sinai's Al-Arish.
Arabiya news channel and local sources said ISIS regarded some of the worshippers as apostates because they revere saints and shrines, which for Islamists is tantamount to idolatry.
The attack started when an explosive went off in a building adjacent to the mosque, and gunmen fired at worshippers as they fled, eyewitnesses told CNN.
"It is a cowardly attack that aims to destabilize the [country's] unity, spread bitterness, and make us doubt our abilities", al-Sisi said while addressing the nation, adding, "however, this attack will do nothing but make us stronger and more persistent to combat terrorism".
Security has always been one of the key sources of public support for the former general, who is expected to run for re-election for another four-year term early next year.
Image The attack happened in Sinai
Egypt's General Prosecutor released an official statement on Friday evening, confirming that death toll of the Al-Rawaady mosque bombing reached 235 and left 109 others injured.
The White House also said in a statement that "the global community must continue to strengthen its efforts to defeat terrorist groups that threaten the United States and our partners and we must collectively discredit the extremist ideology that forms the basis of their existence".
Trump later called Sisi to express his condolences and said the United States "stands by Egypt's side in its fight against terrorism and is ready to strengthen cooperation with Egypt in this field", according to a statement from Sisi's office.
A tribal leader and head of a Bedouin militia that fights IS said that the mosque is known as a place of gathering for Sufis.
Islamic State earlier this year posted a video of the beheading of two Sufis in northern Sinai, accusing them of practicing "sorcery".
Egyptians gather around bodies following a gun and bombing attack at the Rawda mosque in North Sinai, Egypt, on November 24, 2017. In September, Trump promoted the travel ban as well as his own accomplishments in response to the deadly terror attack in London.
Hundreds of police, soldiers and civilians have been killed since then, majority in attacks carried out by fighters loyal to Islamic State, who consider Sinai one of the provinces of the group's self-proclaimed caliphate.
Graeme Le Saux on Liverpool v Chelsea: Conte can expose defensive frailties
Champions Chelsea then come next with 25 points, meaning they are nine adrift of Pep Guardiola's City in the defence of their crown.