US President Barack Obama voiced renewed determination to destroy the Islamic State (ISIS) group Monday, vowing to win back territory in the Middle East and kill the group’s leaders.

Sounding a notably more strident tone, Obama said that the United States and its allies were taking the fight to Islamic State in Iraq and Syria.

“We are hitting them harder than ever,” said Obama, in a second address following a lethal shooting attack by ISIS supporters in San Bernardino that strengthen doubts about his strategy.

“As we squeeze its heart, we will make it harder for ISIS to pump the propaganda to the rest of the world,” Obama insisted at the Pentagon after meeting with US military leaders.

Listing a series of Islamic State leaders killed in coalition operations, Obama issued a stern warning.

“ISIL leaders cannot hide,” he said, using another acronym for the group. “Our next message to them is simple, you are next.”

Even before a Muslim jihadist husband and wife in California murdered 14 people in the attack, polls showed that more than 60% of Americans disapproved of the way Obama is handling the Islamic State and the broader terror threat.

As was the case in his primetime Oval Office address a week ago, Obama offered no shift in policy, but admitted: “We are recognizing that progress needs to keep coming faster.”

Obama has been harshly condemned even by his own party for his handling of ISIS, and back in June he admitted that he does not have “a complete strategy” to fight ISIS.

The president showed further poor assessment last month, when right before the lethal ISIS attacks in Paris that left 130 murdered he said the US had “contained” the jihadist group. Obama likewise said immediately after the attack that it was a “setback,” but that he had the “right strategy” to defeat the group.

Lt. Gen. (ret.) Michael Flynn, former head of the US Defense Intelligence Agency (DIA) from 2012 to 2014, told CNN earlier this month that Obama ignored a report in 2012 about the rise of Islamic State (ISIS) because it didn’t meet his reelection “narrative.”