Sen. Jeff SessionsJefferson (Jeff) Beauregard SessionsHarris walks fine line on Barrett as election nears The Hill's Morning Report - Sponsored by Facebook - Trump's erratic tweets upend stimulus talks; COVID-19 spreads in White House The Memo: Team Trump looks to Pence to steady ship in VP debate MORE (R-Ala.) on Sunday defended presumptive GOP presidential nominee Donald TrumpDonald John TrumpJudge rules to not release Russia probe documents over Trump tweets Trump and advisers considering firing FBI director after election: WaPo Obama to campaign for Biden in Florida MORE for the comments he made about President Obama in the wake of the Orlando nightclub attack.

"I don't understand the president's view on this at all. I think it's totally inexplicable," Sessions said on "Fox News Sunday" regarding the president's refusal to use the words "radical Islam" to describe the attack.

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"And when Donald Trump went directly at [presumptive Democratic presidential nominee] Hillary ClintonHillary Diane Rodham ClintonJudge rules to not release Russia probe documents over Trump tweets Trump and advisers considering firing FBI director after election: WaPo Obama to campaign for Biden in Florida MORE on this, for the first time she said the words Islamic extremism, or something to that effect. ... Of course that's what it is; of course this is what the threat is."

Sessions said the threat of radical Islam is "out there, it's growing and ... it looks like it will continue to grow.

"The threat is still expanding," he said.

In the wake of the attack, Trump cast doubt on Obama's commitment to fighting radical Islamic terrorism, saying "there's something going on."

"We're led by a man that either is not tough, not smart, or he's got something else in mind," the businessman said on "Fox and Friends."

Sessions said that although he doesn't know exactly what Trump was referring to, he defended the candidate's criticism of the president. He said the president doesn't understand the threat the country faces from the Islamic State in Iraq and Syria (ISIS).

"I do believe he is correct to raise the question that the policy of this administration, going back to 2011, when we withdrew all our troops from Iraq and allowed ISIS to form and become an entity, probably would never have happened otherwise," Sessions said.