The parents of slain U.S. human rights activist Kayla Mueller said Sunday that their daughter might still be alive had former President Obama been as "decisive" as President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE in ordering military action to recover her from ISIS before her death in 2015.

Mueller's parents told The Arizona Republic that they credited Trump with bringing Mueller's killers to justice after the president announced Sunday morning that ISIS leader Abu Bakr al-Baghdadi had been killed in a U.S. raid.

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"I still say Kayla should be here, and if Obama had been as decisive as President Trump, maybe she would have been," Marsha Mueller told the newspaper.

"For me what matters most I'm hoping now we will finally get the answers we have been asking for all along," she added. "I think this administration truly might help us. I don’t think they are as closed about what happened."

Her husband, Carl Mueller, added that it was "important" to him that Trump knew of his daughter's story and thanked the president for mentioning Kayla Mueller's name in his address Sunday morning.

"He knows her story. He's been briefed on it, and he knows, and that’s important to me," he said, according to the Republic. "I don’t think anything would have stopped him from getting this guy."

Mueller, an Arizona-born human rights activist working in Syria, was abducted in 2013 after leaving a hospital and remained in ISIS captivity for months, reportedly being forced into marriage to al-Baghdadi himself.

She was confirmed by U.S. forces in 2015 to have been killed by a Jordanian airstrike targeting ISIS-held areas in Raqqa, Syria.

Updated on Monday at 11:43 a.m.