Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE says he believes the mother and sister of Syed Farook, one of the alleged shooters in the San Bernardino massacre, knew that a terror attack was being planned.

“I believe the that the sister of the killer, I watched her interview, I think she knew what was going on,” Trump told reporters after a speech in Iowa on Saturday. “I think his mother knew what was going on.”

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The GOP front-runner said the family members had been in the apartment of the alleged attackers, which authorities said contained thousands of rounds of ammunition, 12 pipe bombs and materials to make several improvised explosive devices (IEDs).

“She went into the apartment,” Trump said of Farook’s mother. “Anybody that went in to that house or that apartment knew what was going on. They didn’t tell authorities. They knew what was going on. The mother knew.

“I think the sister interviewed, I think she knew,” he added. “We better get a little tough, and a little smart, or we’re in trouble.”

Farook and his wife, Tashfeen Malik, are suspected of killing 14 people and wounding 21 at the Inland Regional Center in San Bernardino, Calif., on Wednesday.

Authorities said Malik pledged her allegiance to the Islamic State in Iraq and Syria (ISIS) during the attack.

Trump called the couple “chick s--t” earlier at the Iowa rally.

The FBI is investigating it as an “act of terror,” but the lawyers representing the Farook family pushed back on the characterization on Friday, describing Malik as a “typical housewife.”

Farook’s brother is a decorated Navy veteran who received several commendations for his role in the war on terror.

The suspect’s brother-in-law said he was “in shock” after the attack.

The landlord of Farook’s apartment also said he had never suspected the couple of being terrorists.

President Obama will deliver a rare address from the Oval Office on Sunday at 8:00 p.m. discussing the San Bernardino attack and the broader terror threat to the U.S.